Make classes and structures in core/inspector fast-allocated.

Source/core/inspector/v8/V8DebuggerClient.h

 // Copyright 2015 The Chromium 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 V8DebuggerClient_h
 #define V8DebuggerClient_h
 
 #include "core/CoreExport.h"
+#include "wtf/FastAllocBase.h"
 
 #include <v8.h>
 
 namespace blink {
 
 class V8DebuggerListener;
 
 class CORE_EXPORT V8DebuggerClient {
+    WTF_MAKE_FAST_ALLOCATED(V8DebuggerClient);
 public:
     virtual ~V8DebuggerClient() { }
     virtual v8::Local<v8::Object> compileDebuggerScript() = 0;
     virtual void runMessageLoopOnPause(v8::Local<v8::Context>) = 0;
     virtual void quitMessageLoopOnPause() = 0;
 };
 
 } // namespace blink
 
 
 #endif // V8DebuggerClient_h