[downloads] Set initiator when handling downloads via a[download]

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 b25224c14636cbe1d8dd417913d185e397be8474..05500b42668bfb644f4756dea2c6a24b0a1f70e7 100644
--- a/content/browser/frame_host/render_frame_message_filter.h
+++ b/content/browser/frame_host/render_frame_message_filter.h
@@ -23,6 +23,7 @@
 #endif
 
 struct FrameHostMsg_CreateChildFrame_Params;
+struct FrameHostMsg_DownloadUrl_Params;
 class GURL;
 
 namespace net {
@@ -71,6 +72,7 @@ class CONTENT_EXPORT RenderFrameMessageFilter
                            int render_frame_id,
                            const GURL& url,
                            const Referrer& referrer,
+                           const url::Origin& initiator,
                            const base::string16& suggested_name,
                            const bool use_prompt) const;
 
@@ -97,11 +99,8 @@ class CONTENT_EXPORT RenderFrameMessageFilter
                              const GetCookiesCallback& callback,
                              const net::CookieList& cookie_list);
 
-  void OnDownloadUrl(int render_view_id,
-                     int render_frame_id,
-                     const GURL& url,
-                     const Referrer& referrer,
-                     const base::string16& suggested_name);
+  void OnDownloadUrl(const FrameHostMsg_DownloadUrl_Params& params);
+
   void OnSaveImageFromDataURL(int render_view_id,
                               int render_frame_id,
                               const std::string& url_str);