Remove grab-bag includes of v8.h from everywhere.

src/extensions/free-buffer-extension.cc

 // Copyright 2013 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.
 
 #include "src/extensions/free-buffer-extension.h"
 
 #include "src/base/platform/platform.h"
-#include "src/v8.h"
+#include "src/isolate.h"
+#include "src/objects-inl.h"  // TODO(mstarzinger): Temporary cycle breaker!
 
 namespace v8 {
 namespace internal {
 
 
 v8::Local<v8::FunctionTemplate> FreeBufferExtension::GetNativeFunctionTemplate(
     v8::Isolate* isolate, v8::Local<v8::String> str) {
   return v8::FunctionTemplate::New(isolate, FreeBufferExtension::FreeBuffer);
 }
 
 
 void FreeBufferExtension::FreeBuffer(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   v8::Local<v8::ArrayBuffer> arrayBuffer = args[0].As<v8::ArrayBuffer>();
   v8::ArrayBuffer::Contents contents = arrayBuffer->Externalize();
   Isolate* isolate = reinterpret_cast<Isolate*>(args.GetIsolate());
   isolate->array_buffer_allocator()->Free(contents.Data(),
                                           contents.ByteLength());
 }
 
 }  // namespace internal
 }  // namespace v8