[DevTools] Remove ScriptDebugListener from V8Debugger.

Source/core/inspector/MainThreadDebugger.cpp

 /*
  * Copyright (c) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 47 matching lines @@
 static LocalFrame* retrieveFrameWithGlobalObjectCheck(v8::Local<v8::Context> context)
 {
     return toLocalFrame(toFrameIfNotDetached(context));
 }
 
 // TODO(Oilpan): avoid keeping a raw reference separate from the
 // owner one; does not enable heap-movable objects.
 MainThreadDebugger* MainThreadDebugger::s_instance = nullptr;
 
 MainThreadDebugger::MainThreadDebugger(PassOwnPtr<ClientMessageLoop> clientMessageLoop, v8::Isolate* isolate)
-    : ScriptDebuggerBase(isolate, V8Debugger::create(isolate, this))
+    : ScriptDebuggerBase(isolate)
     , m_clientMessageLoop(clientMessageLoop)
     , m_pausedFrame(nullptr)
     , m_taskRunner(adoptPtr(new InspectorTaskRunner(isolate)))
 {
     MutexLocker locker(creationMutex());
     ASSERT(!s_instance);
     s_instance = this;
 }
 
 MainThreadDebugger::~MainThreadDebugger()
@@ skipping 98 matching lines @@
 
     m_pausedFrame = 0;
 }
 
 void MainThreadDebugger::quitMessageLoopOnPause()
 {
     m_clientMessageLoop->quitNow();
 }
 
 } // namespace blink