Move download messages from Renderer to Frame filter.

content/browser/frame_host/render_frame_message_filter.h

Index: content/browser/frame_host/render_frame_message_filter.h
diff --git a/content/browser/frame_host/render_frame_message_filter.h b/content/browser/frame_host/render_frame_message_filter.h
index 16190cf3d670b81531fa0ed06f67894dea6e7d07..40716cd67465d03621ca898d1122efb67691f668 100644
--- a/content/browser/frame_host/render_frame_message_filter.h
+++ b/content/browser/frame_host/render_frame_message_filter.h
@@ -31,6 +31,7 @@ class URLRequestContextGetter;
 namespace content {
 class BrowserContext;
 class PluginServiceImpl;
+struct Referrer;
 class RenderWidgetHelper;
 class ResourceContext;
 struct WebPluginInfo;
@@ -41,7 +42,7 @@ struct WebPluginInfo;
 // with the routing id for a newly created RenderFrame.
 //
 // This object is created on the UI thread and used on the IO thread.
-class RenderFrameMessageFilter : public BrowserMessageFilter {
+class CONTENT_EXPORT RenderFrameMessageFilter : public BrowserMessageFilter {
  public:
   RenderFrameMessageFilter(int render_process_id,
                            PluginServiceImpl* plugin_service,
@@ -52,6 +53,17 @@ class RenderFrameMessageFilter : public BrowserMessageFilter {
   // BrowserMessageFilter methods:
   bool OnMessageReceived(const IPC::Message& message) override;
 
+ protected:
+  friend class TestSaveImageFromDataURL;
+
+  // This method will be overridden by TestSaveImageFromDataURL class for test.
+  virtual void DownloadUrl(int render_view_id,
+                           int render_frame_id,
+                           const GURL& url,
+                           const Referrer& referrer,
+                           const base::string16& suggested_name,
+                           const bool use_prompt) const;
+
  private:
   class OpenChannelToPpapiPluginCallback;
   class OpenChannelToPpapiBrokerCallback;
@@ -85,6 +97,15 @@ class RenderFrameMessageFilter : public BrowserMessageFilter {
   void SendGetCookiesResponse(IPC::Message* reply_msg,
                               const std::string& cookies);
 
+  void OnDownloadUrl(int render_view_id,
+                     int render_frame_id,
+                     const GURL& url,
+                     const Referrer& referrer,
+                     const base::string16& suggested_name);
+  void OnSaveImageFromDataURL(int render_view_id,
+                              int render_frame_id,
+                              const std::string& url_str);
+
   void OnAre3DAPIsBlocked(int render_frame_id,
                           const GURL& top_origin_url,
                           ThreeDAPIType requester,