Start moving context menu code to RenderFrame.

content/browser/web_contents/web_contents_view_mac.mm

Index: content/browser/web_contents/web_contents_view_mac.mm
===================================================================
--- content/browser/web_contents/web_contents_view_mac.mm	(revision 247964)
+++ content/browser/web_contents/web_contents_view_mac.mm	(working copy)
@@ -230,7 +230,9 @@
   }
 }
 
-void WebContentsViewMac::ShowContextMenu(const ContextMenuParams& params) {
+void WebContentsViewMac::ShowContextMenu(
+    content::RenderFrameHost* render_frame_host,
+    const ContextMenuParams& params) {
   // Allow delegates to handle the context menu operation first.
   if (web_contents_->GetDelegate() &&
       web_contents_->GetDelegate()->HandleContextMenu(params)) {
@@ -238,7 +240,7 @@
   }
 
   if (delegate())
-    delegate()->ShowContextMenu(params);
+    delegate()->ShowContextMenu(render_frame_host, params);
   else
     DLOG(ERROR) << "Cannot show context menus without a delegate.";
 }