Update to Chromium revision 40af916d (#303546).

- Standardize usage of virtual/override specifiers in CEF internals (see http://crbug.com/417463).

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@1903 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/browser/browser_pref_store.h

@@ -17,7 +17,7 @@ class CefBrowserPrefStore : public TestingPrefStore {
   scoped_ptr<PrefService> CreateService();
 
  protected:
-  virtual ~CefBrowserPrefStore();
+  ~CefBrowserPrefStore() override;
 
   DISALLOW_COPY_AND_ASSIGN(CefBrowserPrefStore);
 };