Revert "[LCPP] LCP ScriptObserver web_tests."

This reverts commit c650d59.

Reason for revert: Consistently failing test (first build): https://ci.chromium.org/ui/p/chromium/builders/ci/WebKit%20Linux%20ASAN/50226/overview

Original change's description:
> [LCPP] LCP ScriptObserver web_tests.
>
> This CL adds test cases for crrev.com/c/4651499. The tests assert
> that LCPScriptObserver's HTMLImageElement script dependency feature
> works as expected in different scenarios that involve async scripts.
>
> Bug: 1419756
> Change-Id: Id60df6649cccaf35f51acbd86995c96a08fcd897
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4767918
> Reviewed-by: Weizhong Xia <weizhong@google.com>
> Reviewed-by: Minoru Chikamune <chikamune@chromium.org>
> Reviewed-by: Yoshisato Yanagisawa <yyanagisawa@chromium.org>
> Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
> Commit-Queue: Kouhei Ueno <kouhei@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1187099}

Bug: 1419756
Change-Id: Ia30b3726e15c10e6c84c8295b9e9800ff6cc37c1
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4803711
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Owners-Override: Andy Paicu <andypaicu@google.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Andy Paicu <andypaicu@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1187168}

third_party/blink/renderer/core/testing/internals.cc

@@ -4046,9 +4046,4 @@ void Internals::setBackForwardCacheRestorationBufferSize(unsigned int maxSize) {
   perf.setBackForwardCacheRestorationBufferSizeForTest(maxSize);
 }
 
-Vector<String> Internals::getCreatorScripts(HTMLImageElement* img) {
-  DCHECK(img);
-  return Vector<String>(img->creator_scripts());
-}
-
 }  // namespace blink

third_party/blink/renderer/core/testing/internals.h

@@ -87,7 +87,6 @@ class StaticSelection;
 class Text;
 class TypeConversions;
 class UnionTypesTest;
-class HTMLImageElement;
 
 template <typename NodeType>
 class StaticNodeTypeList;
@@ -643,10 +642,6 @@ class Internals final : public ScriptWrappable {
 
   InternalsUkmRecorder* initializeUKMRecorder();
 
-  // Returns scripts that created an image, as observed by
-  // the LCPScriptObserver Probe.
-  Vector<String> getCreatorScripts(HTMLImageElement* img);
-
  private:
   Document* ContextDocument() const;
   Vector<String> IconURLs(Document*, int icon_types_mask) const;

third_party/blink/renderer/core/testing/internals.idl

@@ -452,6 +452,4 @@ interface Internals {
     void setAllowPerChunkTransferring(ReadableStream stream);
 
     void setBackForwardCacheRestorationBufferSize(long maxSize);
-
-    sequence<DOMString> getCreatorScripts(HTMLImageElement img);
 };

third_party/blink/web_tests/VirtualTestSuites

@@ -2430,26 +2430,6 @@
       "kouhei@chromium.org"
     ]
   },
-  {
-    "prefix": "lcp-script-observer",
-    "platforms": [
-      "Linux",
-      "Mac",
-      "Win"
-    ],
-    "bases": [
-      "http/tests/lcp-script-observer"
-    ],
-    "exclusive_tests": "ALL",
-    "args": [
-      "--enable-features=LCPCriticalPathPredictor,LCPScriptObserver"
-    ],
-    "expires": "Sep 10, 2024",
-    "owners": [
-      "alexnj@chromium.org",
-      "kouhei@chromium.org"
-    ]
-  },
   {
     "prefix": "fetch-later",
     "platforms": ["Linux", "Mac", "Win"],