Move DidStartLoading, DidStopLoading, DidChangeLoadProgress to RFHI.

content/browser/frame_host/interstitial_page_navigator_impl.cc

Index: content/browser/frame_host/interstitial_page_navigator_impl.cc
diff --git a/content/browser/frame_host/interstitial_page_navigator_impl.cc b/content/browser/frame_host/interstitial_page_navigator_impl.cc
index fc45950742d3ad8007dd948aad406be4b69f22e3..8b1a3a6865f238458a77200361f06e61ed038ec9 100644
--- a/content/browser/frame_host/interstitial_page_navigator_impl.cc
+++ b/content/browser/frame_host/interstitial_page_navigator_impl.cc
@@ -17,6 +17,10 @@ InterstitialPageNavigatorImpl::InterstitialPageNavigatorImpl(
     : interstitial_(interstitial),
       controller_(navigation_controller) {}
 
+NavigatorDelegate* InterstitialPageNavigatorImpl::GetDelegate() {
+  return interstitial_;
+}
+
 NavigationController* InterstitialPageNavigatorImpl::GetController() {
   return controller_;
 }