Fix virtual/override/final usage in Source/modules/.

Source/modules/navigatorcontentutils/testing/NavigatorContentUtilsClientMock.h

Index: Source/modules/navigatorcontentutils/testing/NavigatorContentUtilsClientMock.h
diff --git a/Source/modules/navigatorcontentutils/testing/NavigatorContentUtilsClientMock.h b/Source/modules/navigatorcontentutils/testing/NavigatorContentUtilsClientMock.h
index 76271890a4f9e91eccabe2d988acdd410563640c..8754f68f1526dca0564dfe74edfefe4b9c9ebba9 100644
--- a/Source/modules/navigatorcontentutils/testing/NavigatorContentUtilsClientMock.h
+++ b/Source/modules/navigatorcontentutils/testing/NavigatorContentUtilsClientMock.h
@@ -17,7 +17,7 @@ class KURL;
 class NavigatorContentUtilsClientMock : public NavigatorContentUtilsClient {
 public:
     NavigatorContentUtilsClientMock() { }
-    virtual ~NavigatorContentUtilsClientMock() { }
+    ~NavigatorContentUtilsClientMock() override { }
 
     virtual void registerProtocolHandler(const String& scheme, const KURL&, const String& title);