Revert of Simple BlinkGC heap compaction.

third_party/WebKit/Source/wtf/Vector.h

Index: third_party/WebKit/Source/wtf/Vector.h
diff --git a/third_party/WebKit/Source/wtf/Vector.h b/third_party/WebKit/Source/wtf/Vector.h
index 6410cd274b0a61d83f0347436d7e832b9ec6956d..f069d933fca4d57674a09a6260c1682f0210eb9c 100644
--- a/third_party/WebKit/Source/wtf/Vector.h
+++ b/third_party/WebKit/Source/wtf/Vector.h
@@ -491,8 +491,6 @@
     // buffer.
     return buffer();
   }
-
-  T** bufferSlot() { return &m_buffer; }
 
  protected:
   using Base::m_size;
@@ -773,8 +771,6 @@
     return buffer() && buffer() != inlineBuffer();
   }
 
-  T** bufferSlot() { return &m_buffer; }
-
  protected:
   using Base::m_size;
 
@@ -1607,7 +1603,6 @@
     if (Allocator::isHeapObjectAlive(buffer()))
       return;
     Allocator::markNoTracing(visitor, buffer());
-    Allocator::registerBackingStoreReference(visitor, Base::bufferSlot());
   }
   const T* bufferBegin = buffer();
   const T* bufferEnd = buffer() + size();