PlzNavigate support in data use ascriber

chrome/browser/data_use_measurement/chrome_data_use_ascriber.h

Index: chrome/browser/data_use_measurement/chrome_data_use_ascriber.h
diff --git a/chrome/browser/data_use_measurement/chrome_data_use_ascriber.h b/chrome/browser/data_use_measurement/chrome_data_use_ascriber.h
index 76ca16ac174f035e3695c75588cbb0bfe1b73dba..d1dcd4d83cae72b37b8f4c880c5cb436cb7fe944 100644
--- a/chrome/browser/data_use_measurement/chrome_data_use_ascriber.h
+++ b/chrome/browser/data_use_measurement/chrome_data_use_ascriber.h
@@ -144,6 +144,10 @@ class ChromeDataUseAscriber : public DataUseAscriber {
   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);