Remove unused V8 integration code in Sky

sky/engine/v8_inspector/inspector_backend_mojo.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_V8_INSPECTOR_INSPECTOR_BACKEND_MOJO_H_
-#define SKY_ENGINE_V8_INSPECTOR_INSPECTOR_BACKEND_MOJO_H_
-
-#include "base/basictypes.h"
-#include "base/memory/scoped_ptr.h"
-#include "sky/services/inspector/inspector.mojom.h"
-
-// The impl still uses namespace blink for convenience.
-namespace blink {
-class InspectorBackendMojoImpl;
-}
-
-namespace inspector {
-class InspectorHost;
-
-class InspectorBackendMojo {
- public:
-  explicit InspectorBackendMojo(InspectorHost*);
-  ~InspectorBackendMojo();
-
-  void Connect();
-
- private:
-  scoped_ptr<blink::InspectorBackendMojoImpl> impl_;
-
-  DISALLOW_COPY_AND_ASSIGN(InspectorBackendMojo);
-};
-
-}  // namespace inspector
-
-#endif  // SKY_ENGINE_V8_INSPECTOR_INSPECTOR_BACKEND_MOJO_H_