Revert of 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 a6ef88b04e0727109f1ef1e6d06e50b3192fd008..5cc17b8082475b77f0a65065e02c18f423747160 100644
--- a/content/browser/web_contents/web_contents_impl.h
+++ b/content/browser/web_contents/web_contents_impl.h
@@ -1064,10 +1064,18 @@ 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_;