Fix leaking of RenderFrames.

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index e5146f415d8201e860b63d368a8b865fbc381c49..047ee3a8dfbf13a14a576c3ca7e6a0b8f9b22947 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -167,6 +167,11 @@ class CONTENT_EXPORT RenderFrameImpl
                           CompositorDependencies* compositor_deps,
                           const FrameMsg_NewFrame_WidgetParams& params);
 
+  // Deletes a RenderFrame identified by |routing_id|. It must be used only
+  // for deleting a RenderFrame used for pending cross-process navigations.
+  // All other cases are handled through either detaching or swapping frames.
+  static void DeleteFrame(int routing_id);
+
   // Returns the RenderFrameImpl for the given routing ID.
   static RenderFrameImpl* FromRoutingID(int routing_id);