Clean up source_site_instance usage in Navigator::RequestOpenURL.

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 f0d8d06376d69286e96bfca5db50aa2f39ee9ff3..e3972d6f2c01da04b1fce6300f320978b3e61a12 100644
--- a/content/browser/frame_host/render_frame_host_impl.h
+++ b/content/browser/frame_host/render_frame_host_impl.h
@@ -375,15 +375,6 @@ class CONTENT_EXPORT RenderFrameHostImpl
   // Navigates to an interstitial page represented by the provided data URL.
   void NavigateToInterstitialURL(const GURL& data_url);
 
-  // Treat this prospective navigation as though it originated from the frame.
-  // Used, e.g., for a navigation request that originated from a RemoteFrame.
-  // |source_site_instance| is the SiteInstance of the frame that initiated the
-  // navigation.
-  // TODO(creis): Remove this method and have RenderFrameProxyHost call
-  // RequestOpenURL with its FrameTreeNode.
-  void OpenURL(const FrameHostMsg_OpenURL_Params& params,
-               SiteInstance* source_site_instance);
-
   // Stop the load in progress.
   void Stop();