Replace SkBitmap with gfx::Image in the ImageFetcher API.

ios/chrome/browser/suggestions/image_fetcher_impl.h

Index: ios/chrome/browser/suggestions/image_fetcher_impl.h
diff --git a/ios/chrome/browser/suggestions/image_fetcher_impl.h b/ios/chrome/browser/suggestions/image_fetcher_impl.h
index f7fe4dbaa92378c5a5f47e05df0ff16acecb1103..15f45cf1af9bd23f05b31fcde1b5f737a5df32bf 100644
--- a/ios/chrome/browser/suggestions/image_fetcher_impl.h
+++ b/ios/chrome/browser/suggestions/image_fetcher_impl.h
@@ -10,19 +10,19 @@
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "components/image_fetcher/image_fetcher.h"
+#include "ui/gfx/image/image.h"
 
 class GURL;
 class ImageFetcher;
-class SkBitmap;
-
-namespace image_fetcher {
-class ImageFetcherDelegate;
-}
 
 namespace base {
 class SequencedWorkerPool;
 }
 
+namespace image_fetcher {
+class ImageFetcherDelegate;
+}
+
 namespace net {
 class URLRequestContextGetter;
 }
@@ -42,7 +42,7 @@ class ImageFetcherImpl : public image_fetcher::ImageFetcher {
   void StartOrQueueNetworkRequest(
       const GURL& url,
       const GURL& image_url,
-      base::Callback<void(const GURL&, const SkBitmap*)> callback) override;
+      base::Callback<void(const GURL&, const gfx::Image&)> callback) override;
 
  private:
   std::unique_ptr<::ImageFetcher> imageFetcher_;