[DanglingPointer] Removed dangling pointer saved_files_service_unitte…

…st.cc

Fixed Dangling pointer by assigning null value to |extension_| before replacing with a new reference owned by the extension system

Bug: 1291138
Change-Id: I2eb696de70161119c365932799d7a97c0bb805df
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4930425
Reviewed-by: Trent Apted <tapted@chromium.org>
Commit-Queue: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1209953}

apps/saved_files_service_unittest.cc

@@ -84,7 +84,7 @@ class SavedFilesServiceUnitTest : public testing::Test {
   }
 
   extensions::TestExtensionEnvironment env_;
-  raw_ptr<const extensions::Extension, DanglingUntriaged> extension_;
+  raw_ptr<const extensions::Extension> extension_;
   raw_ptr<SavedFilesService> service_;
   base::FilePath path_;
 };
@@ -152,6 +152,7 @@ TEST_F(SavedFilesServiceUnitTest, NoRetainEntriesPermissionTest) {
   static const char kManifest[] =
       "{\"app\": {\"background\": {\"scripts\": [\"background.js\"]}},"
       "\"permissions\": [\"fileSystem\"]}";
+  extension_ = nullptr;
   extension_ = env_.MakeExtension(base::test::ParseJsonDict(kManifest));
   service_->RegisterFileEntry(extension_->id(), GenerateId(1), path_, true);
   TRACE_CALL(CheckEntrySequenceNumber(1, 0));