Revert of [Suggestions] Move ImageManager to the component

components/suggestions/image_fetcher.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_SUGGESTIONS_IMAGE_FETCHER_H_
-#define COMPONENTS_SUGGESTIONS_IMAGE_FETCHER_H_
-
-#include "base/callback.h"
-#include "components/suggestions/image_fetcher_delegate.h"
-#include "url/gurl.h"
-
-class SkBitmap;
-
-namespace suggestions {
-
-// A class used to fetch server images.
-class ImageFetcher {
- public:
-  ImageFetcher() {}
-  virtual ~ImageFetcher() {}
-
-  virtual void SetImageFetcherDelegate(ImageFetcherDelegate* delegate) = 0;
-
-  virtual void StartOrQueueNetworkRequest(
-      const GURL& url, const GURL& image_url,
-      base::Callback<void(const GURL&, const SkBitmap*)> callback) = 0;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(ImageFetcher);
-};
-
-}  // namespace suggestions
-
-#endif  // COMPONENTS_SUGGESTIONS_IMAGE_FETCHER_H_