OOPIF: Clear old focused frame when focus moves to a cross-process frame.

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 ec3dd50746f54871fd3ee21036323a4d78d3edb6..4562854928734f52baa365d52155bdaee66fc6e7 100644
--- a/content/browser/frame_host/render_frame_host_impl.h
+++ b/content/browser/frame_host/render_frame_host_impl.h
@@ -373,6 +373,9 @@ class CONTENT_EXPORT RenderFrameHostImpl
   // another renderer process.
   void UpdateOpener();
 
+  // Clear focus from this frame in the renderer process.
+  void ClearFocus();
+
   // Deletes the current selection plus the specified number of characters
   // before and after the selection or caret.
   void ExtendSelectionAndDelete(size_t before, size_t after);