Added completion notification to Profile's ClearNetworkingHistorySince.

chrome/browser/profiles/profile.h

Index: chrome/browser/profiles/profile.h
diff --git a/chrome/browser/profiles/profile.h b/chrome/browser/profiles/profile.h
index f2e7b2f755987600a348fc4553035f8820c7fd8a..7edbee1130a64a24ff576993b6d389fef2dd20b3 100644
--- a/chrome/browser/profiles/profile.h
+++ b/chrome/browser/profiles/profile.h
@@ -294,10 +294,13 @@ class Profile : public content::BrowserContext {
   virtual chrome_browser_net::Predictor* GetNetworkPredictor() = 0;
 
   // Deletes all network related data since |time|. It deletes transport
-  // security state since |time| and it also delete HttpServerProperties data.
-  // The implementation is free to run this on a background thread, so when this
-  // method returns data is not guaranteed to be deleted.
-  virtual void ClearNetworkingHistorySince(base::Time time) = 0;
+  // security state since |time| and it also deletes HttpServerProperties data.
+  // Works asynchronously, however if the |completion| callback is non-null, it
+  // will be posted on the UI thread once the removal process completes.
+  // Be aware that theoretically it is possible that |completion| will be
+  // invoked after the Profile instance has been destroyed.
+  virtual void ClearNetworkingHistorySince(base::Time time,
+                                           const base::Closure& completion) = 0;
 
   // Returns the home page for this profile.
   virtual GURL GetHomePage() = 0;