Added completion notification to Profile's ClearNetworkingHistorySince.

chrome/browser/profiles/off_the_record_profile_impl.cc

Index: chrome/browser/profiles/off_the_record_profile_impl.cc
diff --git a/chrome/browser/profiles/off_the_record_profile_impl.cc b/chrome/browser/profiles/off_the_record_profile_impl.cc
index 75d42a62520d1dfa419c5cc24a9833f88e5261a2..df018419ad1a6e4adf650c6bbb796381d6ae65c9 100644
--- a/chrome/browser/profiles/off_the_record_profile_impl.cc
+++ b/chrome/browser/profiles/off_the_record_profile_impl.cc
@@ -452,8 +452,16 @@ chrome_browser_net::Predictor* OffTheRecordProfileImpl::GetNetworkPredictor() {
   return NULL;
 }
 
-void OffTheRecordProfileImpl::ClearNetworkingHistorySince(base::Time time) {
-  // No need to do anything here, our transport security state is read-only.
+void OffTheRecordProfileImpl::ClearNetworkingHistorySince(
+    base::Time time,
+    const base::Closure& completion) {
+  // Nothing to do here, our transport security state is read-only.
+  // Still, fire the callback to indicate we have finished, otherwise the
+  // BrowsingDataRemover will never be destroyed and the dialog will never be
+  // closed. We must do this asynchronously in order to avoid reentrancy issues.
+  if (!completion.is_null()) {
+    BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, completion);
+  }
 }
 
 GURL OffTheRecordProfileImpl::GetHomePage() {