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 735cba8acb25dc9e8cff36bb2870cc7a987155a7..e7cd7c87520d34d8edef126c80f44d859e218d77 100644
--- a/chrome/browser/profiles/profile_impl.cc
+++ b/chrome/browser/profiles/profile_impl.cc
@@ -1087,8 +1087,9 @@ 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() {