[heap] Prevent direct access to StoreBuffer.

src/heap/store-buffer.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_STORE_BUFFER_H_
 #define V8_STORE_BUFFER_H_
 
 #include "src/allocation.h"
 #include "src/base/logging.h"
 #include "src/base/platform/platform.h"
@@ skipping 12 matching lines @@
                                             ObjectSlotCallback slot_callback);
 
 // Used to implement the write barrier by collecting addresses of pointers
 // between spaces.
 class StoreBuffer {
  public:
   explicit StoreBuffer(Heap* heap);
 
   static void StoreBufferOverflow(Isolate* isolate);
 
-  inline Address TopAddress();
-
   void SetUp();
   void TearDown();
 
   // This is used by the mutator to enter addresses into the store buffer.
   inline void Mark(Address addr);
 
   // This is used by the heap traversal to enter the addresses into the store
   // buffer that should still be in the store buffer after GC.  It enters
   // addresses directly into the old buffer because the GC starts by wiping the
   // old buffer and thereafter only visits each cell once so there is no need
@@ skipping 174 matching lines @@
   }
 
  private:
   StoreBuffer* store_buffer_;
   bool stored_state_;
 };
 }
 }  // namespace v8::internal
 
 #endif  // V8_STORE_BUFFER_H_