Move DidStartLoading, DidStopLoading, DidChangeLoadProgress to RFHI.

content/browser/frame_host/navigator_impl.cc

Index: content/browser/frame_host/navigator_impl.cc
diff --git a/content/browser/frame_host/navigator_impl.cc b/content/browser/frame_host/navigator_impl.cc
index 3097a542bd49760ac3a8314f52d54bf62a3ad0f3..0bbd2bd8e2d9a66b137070062ad681c8fc9482ec 100644
--- a/content/browser/frame_host/navigator_impl.cc
+++ b/content/browser/frame_host/navigator_impl.cc
@@ -106,6 +106,10 @@ NavigatorImpl::NavigatorImpl(
 
 NavigatorImpl::~NavigatorImpl() {}
 
+NavigatorDelegate* NavigatorImpl::GetDelegate() {
+  return delegate_;
+}
+
 NavigationController* NavigatorImpl::GetController() {
   return controller_;
 }