Use IOSImageDataFetcherWrapper for favicon

ios/web/public/web_state/web_state.h

Index: ios/web/public/web_state/web_state.h
diff --git a/ios/web/public/web_state/web_state.h b/ios/web/public/web_state/web_state.h
index ec3f46422b91097f71a0836c530ae35eaaa8ba8d..c54cbad34544e7e05d76704662209acf42d30efc 100644
--- a/ios/web/public/web_state/web_state.h
+++ b/ios/web/public/web_state/web_state.h
@@ -21,7 +21,6 @@
 #include "url/gurl.h"
 
 class GURL;
-class SkBitmap;
 
 @class CRWJSInjectionReceiver;
 @class CRWSessionStorage;
@@ -84,19 +83,6 @@ class WebState : public base::SupportsUserData {
     bool is_renderer_initiated;
   };
 
-  // Callback for |DownloadImage()|.
-  typedef base::Callback<void(
-      int, /* id */
-      int, /* HTTP status code */
-      const GURL&, /* image_url */
-      const std::vector<SkBitmap>&, /* bitmaps */
-      /* The sizes in pixel of the bitmaps before they were resized due to the
-         max bitmap size passed to DownloadImage(). Each entry in the bitmaps
-         vector corresponds to an entry in the sizes vector. If a bitmap was
-         resized, there should be a single returned bitmap. */
-      const std::vector<gfx::Size>&)>
-          ImageDownloadCallback;
-
   // Creates a new WebState.
   static std::unique_ptr<WebState> Create(const CreateParams& params);
   // Creates a new WebState from a serialized NavigationManager.
@@ -241,23 +227,6 @@ class WebState : public base::SupportsUserData {
   // Returns the current CRWWebViewProxy object.
   virtual CRWWebViewProxyType GetWebViewProxy() const = 0;
 
-  // Sends a request to download the given image |url| and returns the unique
-  // id of the download request. When the download is finished, |callback| will
-  // be called with the bitmaps received from the renderer.
-  // If |is_favicon| is true, the cookies are not sent and not accepted during
-  // download.
-  // Bitmaps with pixel sizes larger than |max_bitmap_size| are filtered out
-  // from the bitmap results. If there are no bitmap results <=
-  // |max_bitmap_size|, the smallest bitmap is resized to |max_bitmap_size| and
-  // is the only result. A |max_bitmap_size| of 0 means unlimited.
-  // If |bypass_cache| is true, |url| is requested from the server even if it
-  // is present in the browser cache.
-  virtual int DownloadImage(const GURL& url,
-                            bool is_favicon,
-                            uint32_t max_bitmap_size,
-                            bool bypass_cache,
-                            const ImageDownloadCallback& callback) = 0;
-
   // Returns Mojo interface registry for this WebState.
   virtual service_manager::InterfaceRegistry* GetMojoInterfaceRegistry() = 0;