Revert of Simple BlinkGC heap compaction.

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

Index: third_party/WebKit/Source/platform/heap/BlinkGC.h
diff --git a/third_party/WebKit/Source/platform/heap/BlinkGC.h b/third_party/WebKit/Source/platform/heap/BlinkGC.h
index 67cfaef524469249296b5d364eb8afc152200363..a0c271d948ea3a4dd4349e1162666ebe84e608e2 100644
--- a/third_party/WebKit/Source/platform/heap/BlinkGC.h
+++ b/third_party/WebKit/Source/platform/heap/BlinkGC.h
@@ -24,22 +24,6 @@
 using WeakCallback = VisitorCallback;
 using EphemeronCallback = VisitorCallback;
 using PreFinalizerCallback = bool (*)(void*);
-
-// Simple alias to avoid heap compaction type signatures turning into
-// a sea of generic |void*|s.
-using MovableReference = void*;
-
-// Heap compaction supports registering callbacks that are to be invoked
-// when an object is moved during compaction. This is to support internal
-// location fixups that need to happen as a result.
-//
-// i.e., when the object residing at |from| is moved to |to| by the compaction
-// pass, invoke the callback to adjust any internal references that now need
-// to be |to|-relative.
-using MovingObjectCallback = void (*)(void* callbackData,
-                                      MovableReference from,
-                                      MovableReference to,
-                                      size_t);
 
 // List of typed arenas. The list is used to generate the implementation
 // of typed arena related methods.
@@ -69,10 +53,6 @@
     // Only the marking task runs in ThreadHeap::collectGarbage().
     // The sweeping task is split into chunks and scheduled lazily.
     GCWithoutSweep,
-    // After the marking task has run in ThreadHeap::collectGarbage(),
-    // sweep compaction of some heap arenas is performed. The sweeping
-    // of the remaining arenas is split into chunks and scheduled lazily.
-    GCWithSweepCompaction,
     // Only the marking task runs just to take a heap snapshot.
     // The sweeping task doesn't run. The marks added in the marking task
     // are just cleared.
@@ -97,7 +77,7 @@
     NumberOfGCReason,
   };
 
-  enum ArenaIndices {
+  enum HeapIndices {
     EagerSweepArenaIndex = 0,
     NormalPage1ArenaIndex,
     NormalPage2ArenaIndex,