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/url_request_user_data.h

@@ -15,7 +15,7 @@
 class CefURLRequestUserData : public base::SupportsUserData::Data {
  public:
   CefURLRequestUserData(CefRefPtr<CefURLRequestClient> client);
-  virtual ~CefURLRequestUserData();
+  ~CefURLRequestUserData() override;
 
   CefRefPtr<CefURLRequestClient> GetClient();
   static const void* kUserDataKey;