Added completion notification to Profile's ClearNetworkingHistorySince.

chrome/test/base/testing_profile.h

Index: chrome/test/base/testing_profile.h
diff --git a/chrome/test/base/testing_profile.h b/chrome/test/base/testing_profile.h
index 81e4111e8312cf0c2404e82536e7cab00fd48d23..3d3859451f24b171d26de39114cbd8a0dfa2ebb8 100644
--- a/chrome/test/base/testing_profile.h
+++ b/chrome/test/base/testing_profile.h
@@ -294,7 +294,9 @@ class TestingProfile : public Profile {
   void BlockUntilHistoryProcessesPendingRequests();
 
   virtual chrome_browser_net::Predictor* GetNetworkPredictor() OVERRIDE;
-  virtual void ClearNetworkingHistorySince(base::Time time) OVERRIDE;
+  virtual void ClearNetworkingHistorySince(
+      base::Time time,
+      const base::Closure& completion) OVERRIDE;
   virtual GURL GetHomePage() OVERRIDE;
 
   virtual PrefService* GetOffTheRecordPrefs() OVERRIDE;