Revert of Simple BlinkGC heap compaction.

third_party/WebKit/Source/platform/heap/HeapPage.h

Index: third_party/WebKit/Source/platform/heap/HeapPage.h
diff --git a/third_party/WebKit/Source/platform/heap/HeapPage.h b/third_party/WebKit/Source/platform/heap/HeapPage.h
index 3a43031bba9374f1cfc581d758a89aa01ccb96b8..a006d41adf842693779de4f04436644eacf6caf0 100644
--- a/third_party/WebKit/Source/platform/heap/HeapPage.h
+++ b/third_party/WebKit/Source/platform/heap/HeapPage.h
@@ -512,26 +512,6 @@
 
   inline NormalPageArena* arenaForNormalPage() const;
 
-  // Context object holding the state of the arena page compaction pass,
-  // passed in when compacting individual pages.
-  class CompactionContext {
-    STACK_ALLOCATED();
-
-   public:
-    // Page compacting into.
-    NormalPage* m_currentPage = nullptr;
-    // Offset into |m_currentPage| to the next free address.
-    size_t m_allocationPoint = 0;
-    // Chain of available pages to use for compaction. Page compaction
-    // picks the next one when the current one is exhausted.
-    BasePage* m_availablePages = nullptr;
-    // Chain of pages that have been compacted. Page compaction will
-    // add compacted pages once the current one becomes exhausted.
-    BasePage** m_compactedPages = nullptr;
-  };
-
-  void sweepAndCompact(CompactionContext&);
-
  private:
   HeapObjectHeader* findHeaderFromAddress(Address);
   void populateObjectStartBitMap();
@@ -685,8 +665,6 @@
   // All FreeListEntries in the nth list have size >= 2^n.
   FreeListEntry* m_freeLists[blinkPageSizeLog2];
 
-  size_t freeListSize() const;
-
   friend class NormalPageArena;
 };
 
@@ -783,14 +761,8 @@
   bool isLazySweeping() const { return m_isLazySweeping; }
   void setIsLazySweeping(bool flag) { m_isLazySweeping = flag; }
 
-  size_t arenaSize();
-  size_t freeListSize();
-
-  void sweepAndCompact();
-
  private:
   void allocatePage();
-
   Address outOfLineAllocate(size_t allocationSize, size_t gcInfoIndex);
   Address allocateFromFreeList(size_t, size_t gcInfoIndex);