Revert of Oilpan: Implement a GC to take a heap snapshot

Source/platform/heap/Heap.h

Index: Source/platform/heap/Heap.h
diff --git a/Source/platform/heap/Heap.h b/Source/platform/heap/Heap.h
index b84582a9fe8f407a9e72734a5879afb3d0a2f1fb..93404e4af16bc130da2f48f3fa2dd1636e82edc5 100644
--- a/Source/platform/heap/Heap.h
+++ b/Source/platform/heap/Heap.h
@@ -386,7 +386,6 @@
     virtual void removeFromHeap() = 0;
     virtual void sweep() = 0;
     virtual void makeConsistentForGC() = 0;
-    virtual void makeConsistentForMutator() = 0;
 #if defined(ADDRESS_SANITIZER)
     virtual void poisonUnmarkedObjects() = 0;
 #endif
@@ -474,7 +473,6 @@
     virtual void removeFromHeap() override;
     virtual void sweep() override;
     virtual void makeConsistentForGC() override;
-    virtual void makeConsistentForMutator() override;
 #if defined(ADDRESS_SANITIZER)
     virtual void poisonUnmarkedObjects() override;
 #endif
@@ -537,7 +535,6 @@
     virtual void removeFromHeap() override;
     virtual void sweep() override;
     virtual void makeConsistentForGC() override;
-    virtual void makeConsistentForMutator() override;
 #if defined(ADDRESS_SANITIZER)
     virtual void poisonUnmarkedObjects() override;
 #endif
@@ -696,7 +693,6 @@
 
     virtual void clearFreeLists() { }
     void makeConsistentForGC();
-    void makeConsistentForMutator();
 #if ENABLE(ASSERT)
     virtual bool isConsistentForGC() = 0;
 #endif