Revert of Simple BlinkGC heap compaction.

third_party/WebKit/Source/bindings/core/v8/ScriptWrappableVisitor.cpp

 // Copyright 2016 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 "bindings/core/v8/ScriptWrappableVisitor.h"
 
 #include "bindings/core/v8/ActiveScriptWrappable.h"
 #include "bindings/core/v8/DOMWrapperWorld.h"
 #include "bindings/core/v8/ScopedPersistent.h"
 #include "bindings/core/v8/ScriptWrappableVisitorVerifier.h"
 #include "bindings/core/v8/V8AbstractEventListener.h"
 #include "bindings/core/v8/WrapperTypeInfo.h"
 #include "core/dom/DocumentStyleSheetCollection.h"
 #include "core/dom/ElementRareData.h"
 #include "core/dom/NodeListsNodeData.h"
 #include "core/dom/NodeRareData.h"
 #include "core/dom/StyleEngine.h"
 #include "core/dom/shadow/ElementShadow.h"
 #include "core/html/imports/HTMLImportsController.h"
-#include "platform/heap/HeapCompact.h"
 #include "platform/heap/HeapPage.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebScheduler.h"
 #include "wtf/AutoReset.h"
 
 namespace blink {
 
 ScriptWrappableVisitor::~ScriptWrappableVisitor() {}
 
 void ScriptWrappableVisitor::TracePrologue() {
@@ skipping 166 matching lines @@
     }
     m_markingDeque.takeFirst().traceWrappers(this);
   }
   return true;
 }
 
 bool ScriptWrappableVisitor::markWrapperHeader(HeapObjectHeader* header) const {
   if (header->isWrapperHeaderMarked())
     return false;
 
-  // Verify that no compactable & movable objects are slated for
-  // lazy unmarking.
-  DCHECK(!HeapCompact::isCompactableArena(
-      pageFromObject(header)->arena()->arenaIndex()));
   header->markWrapperHeader();
   m_headersToUnmark.push_back(header);
   return true;
 }
 
 void ScriptWrappableVisitor::markWrappersInAllWorlds(
     const ScriptWrappable* scriptWrappable) const {
   DOMWrapperWorld::markWrappersInAllWorlds(
       const_cast<ScriptWrappable*>(scriptWrappable), this);
 }
@@ skipping 79 matching lines @@
       V8PerIsolateData::from(isolate)->scriptWrappableVisitor();
   if (scriptWrappableVisitor)
     scriptWrappableVisitor->performCleanup();
 }
 
 WrapperVisitor* ScriptWrappableVisitor::currentVisitor(v8::Isolate* isolate) {
   return V8PerIsolateData::from(isolate)->scriptWrappableVisitor();
 }
 
 }  // namespace blink