PlzNavigate support in data use ascriber

chrome/browser/data_use_measurement/chrome_data_use_ascriber.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_DATA_USE_MEASUREMENT_CHROME_DATA_USE_ASCRIBER_H_
 #define CHROME_BROWSER_DATA_USE_MEASUREMENT_CHROME_DATA_USE_ASCRIBER_H_
 
 #include <list>
 #include <memory>
 #include <string>
@@ skipping 126 matching lines @@
    private:
     DataUseRecorderEntry entry_;
   };
 
   DataUseRecorderEntry GetOrCreateDataUseRecorderEntry(
       net::URLRequest* request);
 
   void NotifyPageLoadCommit(DataUseRecorderEntry entry);
   void NotifyDataUseCompleted(DataUseRecorderEntry entry);
 
+  // Deletes the first key in |main_render_frame_data_use_map_| whose value
+  // corresponds to |entry|.
+  void DeleteFromMainRenderFrameDataUseMap(DataUseRecorderEntry entry);
+
   DataUseRecorderEntry CreateNewDataUseRecorder(
       net::URLRequest* request,
       DataUse::TrafficType traffic_type);
 
   bool IsRecorderInPendingNavigationMap(net::URLRequest* request);
 
   bool IsRecorderInRenderFrameMap(net::URLRequest* request);
 
   // Owner for all instances of DataUseRecorder. An instance is kept in this
   // list if any entity (render frame hosts, URLRequests, pending navigations)
@@ skipping 28 matching lines @@
 
   // Contains the mainframe IDs that are currently visible.
   base::hash_set<RenderFrameHostID> visible_main_render_frames_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeDataUseAscriber);
 };
 
 }  // namespace data_use_measurement
 
 #endif  // CHROME_BROWSER_DATA_USE_MEASUREMENT_CHROME_DATA_USE_ASCRIBER_H_