Replace image_messages.h with Mojo service

content/browser/frame_host/render_frame_host_impl.h

Index: content/browser/frame_host/render_frame_host_impl.h
diff --git a/content/browser/frame_host/render_frame_host_impl.h b/content/browser/frame_host/render_frame_host_impl.h
index db9e4493e137e5dca9c28f643d55c04c80d46800..2678f2a56e5ae6cf8181b6efb02529f37083d4d4 100644
--- a/content/browser/frame_host/render_frame_host_impl.h
+++ b/content/browser/frame_host/render_frame_host_impl.h
@@ -17,6 +17,7 @@
 #include "base/strings/string_number_conversions.h"  // Temporary
 #include "base/time/time.h"
 #include "content/browser/accessibility/browser_accessibility_manager.h"
+#include "content/browser/image_downloader/image_downloader_dispatcher.h"
 #include "content/browser/site_instance_impl.h"
 #include "content/common/accessibility_mode_enums.h"
 #include "content/common/content_export.h"
@@ -444,6 +445,13 @@ class CONTENT_EXPORT RenderFrameHostImpl
   // Temporary for http://crbug.com/369661.
   std::string CommitCountString();
 
+  // Download image API called by web_contents.
+  int DownloadImage(const GURL& url,
+                    bool is_favicon,
+                    uint32_t max_bitmap_size,
+                    bool bypass_cache,
+                    const WebContents::ImageDownloadCallback& callback);
+
  protected:
   friend class RenderFrameHostFactory;
 
@@ -736,6 +744,9 @@ class CONTENT_EXPORT RenderFrameHostImpl
   // Temporary for http://crbug.com/369661
   int commit_count_ = 0;
 
+  // Dispatcher to do IPC with ImageDownloader Mojo service in RenderFrame.
+  scoped_ptr<ImageDownloaderDispatcher> image_downloader_dispatcher_;
+
   // NOTE: This must be the last member.
   base::WeakPtrFactory<RenderFrameHostImpl> weak_ptr_factory_;