Fix the browser not being notified when a webview embedder handles a navigation.

content/browser/frame_host/render_frame_host_impl.cc

Index: content/browser/frame_host/render_frame_host_impl.cc
diff --git a/content/browser/frame_host/render_frame_host_impl.cc b/content/browser/frame_host/render_frame_host_impl.cc
index 944d444d2d9d16492223aa0b817f738e1876673d..68c64a08b26dc1d00c06c1fe159840b0c21319c9 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -755,6 +755,10 @@ bool RenderFrameHostImpl::OnMessageReceived(const IPC::Message &msg) {
     IPC_MESSAGE_HANDLER(FrameHostMsg_ShowPopup, OnShowPopup)
     IPC_MESSAGE_HANDLER(FrameHostMsg_HidePopup, OnHidePopup)
 #endif
+#if defined(OS_ANDROID)
+    IPC_MESSAGE_HANDLER(FrameHostMsg_NavigationHandledByEmbedder,
+                        OnNavigationHandledByEmbedder)
+#endif
     IPC_MESSAGE_HANDLER(FrameHostMsg_ShowCreatedWindow, OnShowCreatedWindow)
   IPC_END_MESSAGE_MAP()
 
@@ -2264,6 +2268,12 @@ void RenderFrameHostImpl::OnHidePopup() {
 }
 #endif
 
+#if defined(OS_ANDROID)
+void RenderFrameHostImpl::OnNavigationHandledByEmbedder() {
+  frame_tree_node_->StopLoading();
+}
+#endif
+
 void RenderFrameHostImpl::OnShowCreatedWindow(int pending_widget_routing_id,
                                               WindowOpenDisposition disposition,
                                               const gfx::Rect& initial_rect,