Remove parts of //cc we aren't using

cc/debug/traced_picture.h

-// Copyright 2013 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 CC_DEBUG_TRACED_PICTURE_H_
-#define CC_DEBUG_TRACED_PICTURE_H_
-
-#include <string>
-
-#include "base/memory/scoped_ptr.h"
-#include "base/trace_event/trace_event.h"
-#include "cc/resources/picture.h"
-
-namespace cc {
-
-class TracedPicture : public base::trace_event::ConvertableToTraceFormat {
- public:
-  explicit TracedPicture(scoped_refptr<const Picture>);
-
-  static scoped_refptr<base::trace_event::ConvertableToTraceFormat>
-      AsTraceablePicture(const Picture* picture);
-
-  static scoped_refptr<base::trace_event::ConvertableToTraceFormat>
-      AsTraceablePictureAlias(const Picture* original);
-
-  void AppendAsTraceFormat(std::string* out) const override;
-
- private:
-  ~TracedPicture() override;
-
-  void AppendPicture(std::string* out) const;
-  void AppendPictureAlias(std::string* out) const;
-
-  scoped_refptr<const Picture> picture_;
-  bool is_alias_;
-
-  DISALLOW_COPY_AND_ASSIGN(TracedPicture);
-};
-
-}  // namespace cc
-
-#endif  // CC_DEBUG_TRACED_PICTURE_H_