Cleanup image_fetcher::ImageFetcher

ios/chrome/browser/suggestions/image_fetcher_impl.mm

 // 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.
 
 #include "ios/chrome/browser/suggestions/image_fetcher_impl.h"
 
 #include <UIKit/UIKit.h>
 
 #include "base/threading/sequenced_worker_pool.h"
 #include "ios/chrome/browser/net/image_fetcher.h"
+#include "net/url_request/url_request_context_getter.h"
 #include "skia/ext/skia_utils_ios.h"
 
 namespace suggestions {
 
 ImageFetcherImpl::ImageFetcherImpl(
     net::URLRequestContextGetter* url_request_context,
     base::SequencedWorkerPool* blocking_pool) {
   imageFetcher_.reset(new image_fetcher::ImageFetcher(blocking_pool));
   imageFetcher_->SetRequestContextGetter(url_request_context);
 }
@@ skipping 12 matching lines @@
     base::Callback<void(const GURL&, const SkBitmap*)> callback) {
   if (image_url.is_empty()) {
     callback.Run(url, nullptr);
     if (delegate_) {
       delegate_->OnImageFetched(url, nullptr);
     }
     return;
   }
   // Copy url reference so it's retained.
   const GURL page_url(url);
-  image_fetcher::Callback fetcher_callback =
+  image_fetcher::ImageFetchedCallback fetcher_callback =
       ^(const GURL& original_url, int response_code, NSData* data) {
       if (data) {
         // Most likely always returns 1x images.
         UIImage* image = [UIImage imageWithData:data scale:1];
         if (image) {
           SkBitmap bitmap =
               gfx::CGImageToSkBitmap(image.CGImage, [image size], YES);
           callback.Run(page_url, &bitmap);
           if (delegate_) {
             delegate_->OnImageFetched(page_url, &bitmap);
           }
           return;
         }
       }
       callback.Run(page_url, nullptr);
       if (delegate_) {
         delegate_->OnImageFetched(page_url, nullptr);
       }
   };
   imageFetcher_->StartDownload(image_url, fetcher_callback);
 }
 
 }  // namespace suggestions