cc: Remove all blimp code from cc.

cc/blimp/picture_data.h

-// Copyright 2016 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_BLIMP_PICTURE_DATA_H_
-#define CC_BLIMP_PICTURE_DATA_H_
-
-#include <stdint.h>
-
-#include "cc/base/cc_export.h"
-#include "third_party/skia/include/core/SkData.h"
-#include "third_party/skia/include/core/SkRefCnt.h"
-
-namespace cc {
-
-// PictureData is a holder object for a serialized SkPicture and its unique ID.
-struct CC_EXPORT PictureData {
-  PictureData(uint32_t unique_id, sk_sp<SkData> data);
-  PictureData(const PictureData& other);
-  ~PictureData();
-
-  uint32_t unique_id;
-  sk_sp<SkData> data;
-};
-
-}  // namespace cc
-
-#endif  // CC_BLIMP_PICTURE_DATA_H_