Added completion notification to Profile's ClearNetworkingHistorySince.

chrome/browser/profiles/profile_impl.cc

Index: chrome/browser/profiles/profile_impl.cc
diff --git a/chrome/browser/profiles/profile_impl.cc b/chrome/browser/profiles/profile_impl.cc
index 420a0fc4173964b275fa5da90a11caafe5c08799..3513690b68ed38f048d4875a29825f1ec7e618d2 100644
--- a/chrome/browser/profiles/profile_impl.cc
+++ b/chrome/browser/profiles/profile_impl.cc
@@ -1035,8 +1035,9 @@ chrome_browser_net::Predictor* ProfileImpl::GetNetworkPredictor() {
   return predictor_;
 }
 
-void ProfileImpl::ClearNetworkingHistorySince(base::Time time) {
-  io_data_.ClearNetworkingHistorySince(time);
+void ProfileImpl::ClearNetworkingHistorySince(base::Time time,
+                                              const base::Closure& completion) {
+  io_data_.ClearNetworkingHistorySince(time, completion);
 }
 
 GURL ProfileImpl::GetHomePage() {