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 5d6db0a3efae97ee2f5960eb5a2c3239143fddc6..29c84cd8ad112d526a649e2a828865ca9194e5e7 100644
--- a/chrome/browser/profiles/off_the_record_profile_impl.cc
+++ b/chrome/browser/profiles/off_the_record_profile_impl.cc
@@ -416,8 +416,16 @@ 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() {