Added completion notification to Profile's ClearNetworkingHistorySince.

chrome/browser/browsing_data/browsing_data_remover.h

Index: chrome/browser/browsing_data/browsing_data_remover.h
diff --git a/chrome/browser/browsing_data/browsing_data_remover.h b/chrome/browser/browsing_data/browsing_data_remover.h
index 87d305bff6c5ccbf915b5acac313b26f0439184a..1ae23c939d4c4372c95eece7db08b39040acb044 100644
--- a/chrome/browser/browsing_data/browsing_data_remover.h
+++ b/chrome/browser/browsing_data/browsing_data_remover.h
@@ -315,6 +315,9 @@ class BrowsingDataRemover : public content::NotificationObserver,
   // Callback from the above method.
   void OnClearedFormData();
 
+  // Callback when Profile IO data has been deleted.
+  void ClearedProfileIOData();
+
   // Returns true if we're all done.
   bool AllDone();
 
@@ -372,6 +375,7 @@ class BrowsingDataRemover : public content::NotificationObserver,
   bool waiting_for_clear_quota_managed_data_;
   bool waiting_for_clear_content_licenses_;
   bool waiting_for_clear_form_;
+  bool waiting_for_clear_profile_io_data_;
 
   // Tracking how many origins need to be deleted, and whether we're finished
   // gathering origins.