If the renderer drops a navigation, make sure the spinner doesn't spin endlessly.

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 72d53245905548c7587908e18958539a1e3f6875..13bb3160d551efa1c33bffcfa522c75108cc4ada 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -303,6 +303,7 @@ bool RenderFrameHostImpl::OnMessageReceived(const IPC::Message &msg) {
                         OnDidFailLoadWithError)
     IPC_MESSAGE_HANDLER_GENERIC(FrameHostMsg_DidCommitProvisionalLoad,
                                 OnDidCommitProvisionalLoad(msg))
+    IPC_MESSAGE_HANDLER(FrameHostMsg_DidDropNavigation, OnDidDropNavigation)
     IPC_MESSAGE_HANDLER(FrameHostMsg_OpenURL, OnOpenURL)
     IPC_MESSAGE_HANDLER(FrameHostMsg_DocumentOnLoadCompleted,
                         OnDocumentOnLoadCompleted)
@@ -703,6 +704,14 @@ void RenderFrameHostImpl::OnDidCommitProvisionalLoad(const IPC::Message& msg) {
   frame_tree_node()->navigator()->DidNavigate(this, validated_params);
 }
 
+void RenderFrameHostImpl::OnDidDropNavigation() {
+  // At the end of Navigate(), the delegate's DidStartLoading is called to force
+  // the spinner to start, even if the renderer didn't yet begin the load. If it
+  // turns out that the renderer dropped the navigation, we need to turn off the
+  // spinner.
+  delegate_->DidStopLoading(this);
+}
+
 RenderWidgetHostImpl* RenderFrameHostImpl::GetRenderWidgetHost() {
   return static_cast<RenderWidgetHostImpl*>(render_view_host_);
 }