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

Source/core/loader/FrameLoader.h

Index: Source/core/loader/FrameLoader.h
diff --git a/Source/core/loader/FrameLoader.h b/Source/core/loader/FrameLoader.h
index 9bf63cf23e18f86cc0315ee0944c5494bf9ab9a8..fd3d64daf8410c875732a5d87f97cfa4fe7fa358 100644
--- a/Source/core/loader/FrameLoader.h
+++ b/Source/core/loader/FrameLoader.h
@@ -60,6 +60,7 @@
 class IconController;
 class NavigationAction;
 class Page;
+class ProgressTracker;
 class ResourceError;
 class ResourceResponse;
 class SecurityOrigin;
@@ -82,6 +83,7 @@
     LocalFrame* frame() const { return m_frame; }
 
     MixedContentChecker* mixedContentChecker() const { return &m_mixedContentChecker; }
+    ProgressTracker& progress() const { return *m_progressTracker; }
 
     // These functions start a load. All eventually call into loadWithNavigationAction() or loadInSameDocument().
     void load(const FrameLoadRequest&); // The entry point for non-reload, non-history loads.
@@ -111,8 +113,6 @@
 
     bool isLoading() const;
 
-    int numPendingOrLoadingRequests(bool recurse) const;
-
     DocumentLoader* documentLoader() const { return m_documentLoader.get(); }
     DocumentLoader* policyDocumentLoader() const { return m_policyDocumentLoader.get(); }
     DocumentLoader* provisionalDocumentLoader() const { return m_provisionalDocumentLoader.get(); }
@@ -238,8 +238,7 @@
     mutable FrameLoaderStateMachine m_stateMachine;
     mutable MixedContentChecker m_mixedContentChecker;
 
-    class FrameProgressTracker;
-    OwnPtr<FrameProgressTracker> m_progressTracker;
+    OwnPtr<ProgressTracker> m_progressTracker;
 
     FrameState m_state;
     FrameLoadType m_loadType;