Move common ImageFetcher component files to core/

components/image_fetcher/image_fetcher_delegate.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 COMPONENTS_IMAGE_FETCHER_IMAGE_FETCHER_DELEGATE_H_
-#define COMPONENTS_IMAGE_FETCHER_IMAGE_FETCHER_DELEGATE_H_
-
-#include <string>
-
-#include "base/macros.h"
-
-namespace gfx {
-class Image;
-}
-
-namespace image_fetcher {
-
-class ImageFetcherDelegate {
- public:
-  ImageFetcherDelegate() {}
-
-  // Called when the data for an image was fetched. |id| is an identifier for
-  // the fetch (as passed to ImageFetcher::StartOrQueueNetworkRequest); |data|
-  // stores (generally compressed) image data owned by the caller, and can be
-  // empty if the fetch failed.
-  virtual void OnImageDataFetched(const std::string& id,
-                                  const std::string& data) {};
-
-  // Called when an image was fetched and decoded. |id| is an identifier for the
-  // fetch (as passed to ImageFetcher::StartOrQueueNetworkRequest); |image|
-  // stores image data owned by the caller, and can be an empty gfx::Image.
-  virtual void OnImageFetched(const std::string& id,
-                              const gfx::Image& image) {};
-
- protected:
-  virtual ~ImageFetcherDelegate() {}
-
-  DISALLOW_COPY_AND_ASSIGN(ImageFetcherDelegate);
-};
-
-}  // namespace image_fetcher
-
-#endif  // COMPONENTS_IMAGE_FETCHER_IMAGE_FETCHER_DELEGATE_H_