Replace image_messages.h with Mojo service

content/browser/frame_host/render_frame_host_impl.cc

Index: content/browser/frame_host/render_frame_host_impl.cc
diff --git a/content/browser/frame_host/render_frame_host_impl.cc b/content/browser/frame_host/render_frame_host_impl.cc
index e06a88100ad1c8cc1f025ef97a2f56deacbe0e5a..6a0ec15484b4cf5718a26bd8fbb59cb3f59729c3 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -1865,6 +1865,9 @@ void RenderFrameHostImpl::InvalidateMojoConnection() {
 #endif
 
   service_registry_.reset();
+
+  // Disconnect with ImageDownloader Mojo service in RenderFrame.
+  image_downloader_dispatcher_.reset();
 }
 
 bool RenderFrameHostImpl::IsFocused() {
@@ -1877,6 +1880,19 @@ bool RenderFrameHostImpl::IsFocused() {
           frame_tree_->GetFocusedFrame()->IsDescendantOf(frame_tree_node()));
 }
 
+int RenderFrameHostImpl::DownloadImage(
+    const GURL& url,
+    bool is_favicon,
+    uint32_t max_bitmap_size,
+    bool bypass_cache,
+    const WebContents::ImageDownloadCallback& callback) {
+  if (!image_downloader_dispatcher_)
+    image_downloader_dispatcher_.reset(new ImageDownloaderDispatcher(this));
+
+  return image_downloader_dispatcher_->StartDownload(
+      url, is_favicon, max_bitmap_size, bypass_cache, callback);
+}
+
 void RenderFrameHostImpl::UpdateCrossProcessIframeAccessibility(
     const std::map<int32, int>& node_to_frame_routing_id_map) {
   for (const auto& iter : node_to_frame_routing_id_map) {