Use component ImageFetcher instead of iOS one.

ios/chrome/browser/suggestions/image_fetcher_impl.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 IOS_CHROME_BROWSER_SUGGESTIONS_IMAGE_FETCHER_IMPL_H_
-#define IOS_CHROME_BROWSER_SUGGESTIONS_IMAGE_FETCHER_IMPL_H_
-
-#include <memory>
-#include <string>
-
-#include "base/callback_forward.h"
-#include "base/macros.h"
-#include "components/image_fetcher/image_fetcher.h"
-
-class GURL;
-
-namespace base {
-class SequencedWorkerPool;
-}
-
-namespace gfx {
-class Image;
-}
-
-namespace image_fetcher {
-class ImageFetcherDelegate;
-class IOSImageDataFetcherWrapper;
-}
-
-namespace net {
-class URLRequestContextGetter;
-}
-
-namespace suggestions {
-
-// A class used to fetch server images asynchronously.
-class ImageFetcherImpl : public image_fetcher::ImageFetcher {
- public:
-  ImageFetcherImpl(net::URLRequestContextGetter* url_request_context,
-                   base::SequencedWorkerPool* blocking_pool);
-  ~ImageFetcherImpl() override;
-
-  void SetImageFetcherDelegate(
-      image_fetcher::ImageFetcherDelegate* delegate) override;
-
-  void SetDataUseServiceName(DataUseServiceName data_use_service_name) override;
-
-  void StartOrQueueNetworkRequest(
-      const std::string& id,
-      const GURL& image_url,
-      base::Callback<void(const std::string&, const gfx::Image&)> callback)
-      override;
-
- private:
-  std::unique_ptr<image_fetcher::IOSImageDataFetcherWrapper> image_fetcher_;
-
-  image_fetcher::ImageFetcherDelegate* delegate_;
-
-  DISALLOW_COPY_AND_ASSIGN(ImageFetcherImpl);
-};
-
-}  // namespace suggestions
-
-#endif  // IOS_CHROME_BROWSER_SUGGESTIONS_IMAGE_FETCHER_IMPL_H_