Move many of v8_inspector dependencies out of core/

sky/engine/core/inspector/InstrumentingAgents.h

-// Copyright 2014 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 SKY_ENGINE_CORE_INSPECTOR_INSTRUMENTINGAGENTS_H_
-#define SKY_ENGINE_CORE_INSPECTOR_INSTRUMENTINGAGENTS_H_
-
-#include "sky/engine/wtf/Noncopyable.h"
-
-namespace blink {
-
-// This is a stub.
-// This allows one agent to talk to another.
-
-class InspectorDebuggerAgent;
-
-class InstrumentingAgents {
-  WTF_MAKE_NONCOPYABLE(InstrumentingAgents);
-public:
-  InstrumentingAgents(InspectorDebuggerAgent* agent) : debug_agent_(agent) {}
-
-  InspectorDebuggerAgent* inspectorDebuggerAgent() {
-      return debug_agent_;
-  }
-
-private:
-
-  InspectorDebuggerAgent* debug_agent_;
-};
-
-} // namespace blink
-
-#endif  // SKY_ENGINE_CORE_INSPECTOR_INSTRUMENTINGAGENTS_H_