diff --git a/third_party/WebKit/Source/core/dom/BUILD.gn b/third_party/WebKit/Source/core/dom/BUILD.gn
index c23c3a3d3ebfe..13a8eb86ff3c8 100644
--- a/third_party/WebKit/Source/core/dom/BUILD.gn
+++ b/third_party/WebKit/Source/core/dom/BUILD.gn
@@ -197,8 +197,6 @@ blink_core_sources("dom") {
     "Modulator.h",
     "ModuleMap.cpp",
     "ModuleMap.h",
-    "ModulePendingScript.cpp",
-    "ModulePendingScript.h",
     "ModuleScript.cpp",
     "ModuleScript.h",
     "MutationCallback.h",
diff --git a/third_party/WebKit/Source/core/dom/Modulator.h b/third_party/WebKit/Source/core/dom/Modulator.h
index ad1d58268c849..ef95e0b48bf21 100644
--- a/third_party/WebKit/Source/core/dom/Modulator.h
+++ b/third_party/WebKit/Source/core/dom/Modulator.h
@@ -34,13 +34,6 @@ class SingleModuleClient : public GarbageCollectedMixin {
   virtual void NotifyModuleLoadFinished(ModuleScript*) = 0;
 };
 
-// A ModuleTreeClient is notified when a module script and its whole descendent
-// tree load is complete.
-class ModuleTreeClient : public GarbageCollectedMixin {
- public:
-  virtual void NotifyModuleTreeLoadFinished(ModuleScript*) = 0;
-};
-
 // spec: "top-level module fetch flag"
 // https://html.spec.whatwg.org/multipage/webappapis.html#fetching-scripts-is-top-level
 enum class ModuleGraphLevel { kTopLevelModuleFetch, kDependentModuleFetch };
diff --git a/third_party/WebKit/Source/core/dom/ModulePendingScript.cpp b/third_party/WebKit/Source/core/dom/ModulePendingScript.cpp
deleted file mode 100644
index f0184b10301e3..0000000000000
--- a/third_party/WebKit/Source/core/dom/ModulePendingScript.cpp
+++ /dev/null
@@ -1,82 +0,0 @@
-// Copyright 2017 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "core/dom/ModulePendingScript.h"
-
-#include "core/dom/ScriptLoader.h"
-#include "core/frame/LocalFrame.h"
-
-namespace blink {
-
-ModulePendingScriptTreeClient::ModulePendingScriptTreeClient()
-    : module_script_(nullptr), pending_script_(nullptr) {}
-
-void ModulePendingScriptTreeClient::SetPendingScript(
-    ModulePendingScript* pending_script) {
-  DCHECK(!pending_script_);
-  pending_script_ = pending_script;
-
-  if (finished_) {
-    pending_script_->NotifyModuleTreeLoadFinished();
-  }
-}
-
-void ModulePendingScriptTreeClient::NotifyModuleTreeLoadFinished(
-    ModuleScript* module_script) {
-  DCHECK(!(module_script && module_script->InstantiationState() ==
-                                ModuleInstantiationState::kUninstantiated));
-  DCHECK(!finished_);
-  finished_ = true;
-  module_script_ = module_script;
-
-  if (pending_script_)
-    pending_script_->NotifyModuleTreeLoadFinished();
-}
-
-DEFINE_TRACE(ModulePendingScriptTreeClient) {
-  visitor->Trace(module_script_);
-  visitor->Trace(pending_script_);
-  ModuleTreeClient::Trace(visitor);
-}
-
-ModulePendingScript::ModulePendingScript(ScriptElementBase* element,
-                                         ModulePendingScriptTreeClient* client)
-    : PendingScript(element, TextPosition()), module_tree_client_(client) {
-  CHECK(this->GetElement());
-  DCHECK(module_tree_client_);
-  client->SetPendingScript(this);
-}
-
-ModulePendingScript::~ModulePendingScript() {}
-
-void ModulePendingScript::DisposeInternal() {
-  module_tree_client_ = nullptr;
-}
-
-DEFINE_TRACE(ModulePendingScript) {
-  visitor->Trace(module_tree_client_);
-  PendingScript::Trace(visitor);
-}
-
-void ModulePendingScript::NotifyModuleTreeLoadFinished() {
-  CHECK(!IsReady());
-  ready_ = true;
-
-  if (Client())
-    Client()->PendingScriptFinished(this);
-}
-
-Script* ModulePendingScript::GetSource(const KURL& document_url,
-                                       bool& error_occurred) const {
-  CHECK(IsReady());
-  error_occurred = ErrorOccurred();
-  return GetModuleScript();
-}
-
-bool ModulePendingScript::ErrorOccurred() const {
-  CHECK(IsReady());
-  return !GetModuleScript();
-}
-
-}  // namespace blink
diff --git a/third_party/WebKit/Source/core/dom/ModulePendingScript.h b/third_party/WebKit/Source/core/dom/ModulePendingScript.h
deleted file mode 100644
index 62ecccbbcfbac..0000000000000
--- a/third_party/WebKit/Source/core/dom/ModulePendingScript.h
+++ /dev/null
@@ -1,98 +0,0 @@
-// Copyright 2017 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef ModulePendingScript_h
-#define ModulePendingScript_h
-
-#include "core/dom/Modulator.h"
-#include "core/dom/ModuleScript.h"
-#include "core/dom/PendingScript.h"
-
-namespace blink {
-
-class ModulePendingScript;
-
-// ModulePendingScriptTreeClient is used to connect from Modulator::FetchTree()
-// to ModulePendingScript. Because ModulePendingScript is created after
-// Modulator::FetchTree() is called, ModulePendingScriptTreeClient is
-// registered as ModuleTreeClient to FetchTree() first, and later
-// ModulePendingScript is supplied to ModulePendingScriptTreeClient via
-// SetPendingScript() and is notified of module tree load finish.
-class ModulePendingScriptTreeClient final
-    : public GarbageCollectedFinalized<ModulePendingScriptTreeClient>,
-      public ModuleTreeClient {
-  USING_GARBAGE_COLLECTED_MIXIN(ModulePendingScriptTreeClient);
-
- public:
-  static ModulePendingScriptTreeClient* Create() {
-    return new ModulePendingScriptTreeClient();
-  }
-  virtual ~ModulePendingScriptTreeClient() = default;
-
-  void SetPendingScript(ModulePendingScript* client);
-
-  ModuleScript* GetModuleScript() const { return module_script_; }
-
-  DECLARE_TRACE();
-
- private:
-  ModulePendingScriptTreeClient();
-
-  // Implements ModuleTreeClient
-  void NotifyModuleTreeLoadFinished(ModuleScript*) override;
-
-  bool finished_ = false;
-  Member<ModuleScript> module_script_;
-  Member<ModulePendingScript> pending_script_;
-};
-
-// PendingScript for a module script
-// https://html.spec.whatwg.org/#module-script.
-class CORE_EXPORT ModulePendingScript : public PendingScript {
- public:
-  static ModulePendingScript* Create(ScriptElementBase* element,
-                                     ModulePendingScriptTreeClient* client) {
-    return new ModulePendingScript(element, client);
-  }
-
-  ~ModulePendingScript() override;
-
-  void NotifyModuleTreeLoadFinished();
-
-  ModuleScript* GetModuleScript() const {
-    return module_tree_client_->GetModuleScript();
-  }
-
-  DECLARE_TRACE();
-
- private:
-  ModulePendingScript(ScriptElementBase*, ModulePendingScriptTreeClient*);
-
-  // PendingScript
-  ScriptType GetScriptType() const override { return ScriptType::kModule; }
-  Script* GetSource(const KURL& document_url,
-                    bool& error_occurred) const override;
-  bool IsReady() const override { return ready_; }
-  bool IsExternal() const override { return true; }
-  bool ErrorOccurred() const override;
-  bool WasCanceled() const override { return false; }
-
-  void StartStreamingIfPossible(Document*, ScriptStreamer::Type) override {}
-  KURL UrlForClassicScript() const override {
-    NOTREACHED();
-    return KURL();
-  }
-  void RemoveFromMemoryCache() override { NOTREACHED(); }
-
-  void DisposeInternal() override;
-
-  void CheckState() const override {}
-
-  Member<ModulePendingScriptTreeClient> module_tree_client_;
-  bool ready_ = false;
-};
-
-}  // namespace blink
-
-#endif  // ModulePendingScript_h