Pass the ImageDecoder to the ImageFetcher at creation time.

components/image_fetcher/image_fetcher_impl.h

Index: components/image_fetcher/image_fetcher_impl.h
diff --git a/chrome/browser/search/suggestions/image_fetcher_impl.h b/components/image_fetcher/image_fetcher_impl.h
similarity index 75%
rename from chrome/browser/search/suggestions/image_fetcher_impl.h
rename to components/image_fetcher/image_fetcher_impl.h
index 61aaf042fab052867717eab1ad0162ccd5173d6a..b1653afea41ccb6b2fc6d1fb020ec9ed7dce518a 100644
--- a/chrome/browser/search/suggestions/image_fetcher_impl.h
+++ b/components/image_fetcher/image_fetcher_impl.h
@@ -2,10 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CHROME_BROWSER_SEARCH_SUGGESTIONS_IMAGE_FETCHER_IMPL_H_
-#define CHROME_BROWSER_SEARCH_SUGGESTIONS_IMAGE_FETCHER_IMPL_H_
+#ifndef COMPONENTS_IMAGE_FETCHER_IMAGE_FETCHER_IMPL_H_
+#define COMPONENTS_IMAGE_FETCHER_IMAGE_FETCHER_IMPL_H_
 
 #include <map>
+#include <memory>
 #include <string>
 #include <utility>
 #include <vector>
@@ -25,15 +26,20 @@ namespace net {
 class URLRequestContextGetter;
 }
 
-// TODO(markusheintz): Move the ImageFetcherImpl to components/image_fetcher
-namespace suggestions {
+namespace image_fetcher {
 
-// image_fetcher::ImageFetcher implementation.
+// TODO(markusheintz): Once the iOS implementation of the ImageFetcher is
+// removed merge the two classes ImageFetcher and ImageFetcherImpl.
 class ImageFetcherImpl : public image_fetcher::ImageFetcher {
  public:
-  explicit ImageFetcherImpl(net::URLRequestContextGetter* url_request_context);
+  ImageFetcherImpl(
+      std::unique_ptr<image_fetcher::ImageDecoder> image_decoder,
+      net::URLRequestContextGetter* url_request_context);
   ~ImageFetcherImpl() override;
 
+  // Sets the |delegate| of the ImageFetcherImpl. The |delegate| has to be alive
+  // during the lifetime of the ImageFetcherImpl object. It is the caller's
+  // responsibility to ensure this.
   void SetImageFetcherDelegate(
       image_fetcher::ImageFetcherDelegate* delegate) override;
 
@@ -77,7 +83,7 @@ class ImageFetcherImpl : public image_fetcher::ImageFetcher {
 
   image_fetcher::ImageFetcherDelegate* delegate_;
 
-  net::URLRequestContextGetter* url_request_context_;
+  scoped_refptr<net::URLRequestContextGetter> url_request_context_;
 
   std::unique_ptr<image_fetcher::ImageDecoder> image_decoder_;
 
@@ -90,6 +96,6 @@ class ImageFetcherImpl : public image_fetcher::ImageFetcher {
   DISALLOW_COPY_AND_ASSIGN(ImageFetcherImpl);
 };
 
-}  // namespace suggestions
+}  // namespace image_fetcher
 
-#endif  // CHROME_BROWSER_SEARCH_SUGGESTIONS_IMAGE_FETCHER_IMPL_H_
+#endif  // COMPONENTS_IMAGE_FETCHER_IMAGE_FETCHER_IMPL_H_