Revert of Revert of Make start/stop loading notifications per-frame

Source/core/loader/FrameLoaderClient.h

Index: Source/core/loader/FrameLoaderClient.h
diff --git a/Source/core/loader/FrameLoaderClient.h b/Source/core/loader/FrameLoaderClient.h
index 52ea3e71a0914e27d4d7b8fca1a62abca73f75ac..114c4d333e41d8cb14ad2627578c794c082de2d0 100644
--- a/Source/core/loader/FrameLoaderClient.h
+++ b/Source/core/loader/FrameLoaderClient.h
@@ -122,10 +122,9 @@
         virtual void dispatchWillSendSubmitEvent(HTMLFormElement*) = 0;
         virtual void dispatchWillSubmitForm(HTMLFormElement*) = 0;
 
-        // Maybe these should go into a ProgressTrackerClient some day
-        virtual void postProgressStartedNotification(LoadStartType) = 0;
-        virtual void postProgressEstimateChangedNotification() = 0;
-        virtual void postProgressFinishedNotification() = 0;
+        virtual void didStartLoading(LoadStartType) = 0;
+        virtual void progressEstimateChanged(double progressEstimate) = 0;
+        virtual void didStopLoading() = 0;
 
         virtual void loadURLExternally(const ResourceRequest&, NavigationPolicy, const String& suggestedName = String()) = 0;