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

content/browser/frame_host/render_frame_host_delegate.h

Index: content/browser/frame_host/render_frame_host_delegate.h
diff --git a/content/browser/frame_host/render_frame_host_delegate.h b/content/browser/frame_host/render_frame_host_delegate.h
index 6c22d94abf2620ffd350db98afcf79a509a95773..57b2ad428f4b1d733b41471098030f3672792fc0 100644
--- a/content/browser/frame_host/render_frame_host_delegate.h
+++ b/content/browser/frame_host/render_frame_host_delegate.h
@@ -57,13 +57,17 @@ class CONTENT_EXPORT RenderFrameHostDelegate {
   // Informs the delegate whenever a RenderFrameHost is deleted.
   virtual void RenderFrameDeleted(RenderFrameHost* render_frame_host) {}
 
-  // The top-level RenderFrame began loading a new page. This corresponds to
+  // The specified RenderFrame began loading a new page. This corresponds to
   // Blink's notion of the throbber starting.
   // |to_different_document| will be true unless the load is a fragment
   // navigation, or triggered by history.pushState/replaceState.
   virtual void DidStartLoading(RenderFrameHost* render_frame_host,
                                bool to_different_document) {}
 
+  // The specified RenderFrame stopped loading a page. This corresponds to
+  // Blink's notion of the throbber stopping.
+  virtual void DidStopLoading(RenderFrameHost* render_frame_host) {}
+
   // The RenderFrameHost has been swapped out.
   virtual void SwappedOut(RenderFrameHost* render_frame_host) {}