Fix pushState causing stop/reload button and favicon to flicker.

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 b6ebfa9fd35c34a5df1222edbf529c7d87133ea8..f5e00ab2fea154f94623e12cb6460a34472aead2 100644
--- a/content/browser/frame_host/render_frame_host_delegate.h
+++ b/content/browser/frame_host/render_frame_host_delegate.h
@@ -32,7 +32,10 @@ class CONTENT_EXPORT RenderFrameHostDelegate {
 
   // The top-level RenderFrame began loading a new page. This corresponds to
   // Blink's notion of the throbber starting.
-  virtual void DidStartLoading(RenderFrameHost* render_frame_host) {}
+  // |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 top-level RenderFrame stopped loading a page. This corresponds to
   // Blink's notion of the throbber stopping.