Refactor the loading tracking logic in WebContentsImpl.

content/browser/web_contents/web_contents_impl.h

Index: content/browser/web_contents/web_contents_impl.h
diff --git a/content/browser/web_contents/web_contents_impl.h b/content/browser/web_contents/web_contents_impl.h
index 2e0e9661e18fb0fa900b1255b2f7b500a070de69..38e264dc54589e5767e90d53ac4a9af42d9e9a39 100644
--- a/content/browser/web_contents/web_contents_impl.h
+++ b/content/browser/web_contents/web_contents_impl.h
@@ -908,6 +908,10 @@ class CONTENT_EXPORT WebContentsImpl
   // Calculates the progress of the current load and notifies the delegate.
   void SendLoadProgressChanged();
 
+  // Returns true if at least one of the nodes in the |frame_tree_| is loading,
+  // false otherwise.
+  bool IsFrameTreeLoading();
+
   // Misc non-view stuff -------------------------------------------------------
 
   // Sets the history for a specified RenderViewHost to |history_length|
@@ -1063,18 +1067,10 @@ class CONTENT_EXPORT WebContentsImpl
   net::LoadStateWithParam load_state_;
   base::string16 load_state_host_;
 
-  // LoadingProgressMap maps FrameTreeNode IDs to a double representing that
-  // frame's completion (from 0 to 1).
-  typedef base::hash_map<int64, double> LoadingProgressMap;
-  LoadingProgressMap loading_progresses_;
   double loading_total_progress_;
 
   base::TimeTicks loading_last_progress_update_;
 
-  // Counter to track how many frames have sent start notifications but not
-  // stop notifications.
-  int loading_frames_in_progress_;
-
   // Upload progress, for displaying in the status bar.
   // Set to zero when there is no significant upload happening.
   uint64 upload_size_;