Update fetch / loader classes to use OVERRIDE / FINAL when needed

Source/core/loader/LinkLoader.h

Index: Source/core/loader/LinkLoader.h
diff --git a/Source/core/loader/LinkLoader.h b/Source/core/loader/LinkLoader.h
index 4d1f72d7c959d910474f47b0e0ab477fa5b3cea2..23489e293927bab5cb68243f7814639662b34641 100644
--- a/Source/core/loader/LinkLoader.h
+++ b/Source/core/loader/LinkLoader.h
@@ -46,14 +46,14 @@ class LinkRelAttribute;
 class PrerenderHandle;
 
 // The LinkLoader can load link rel types icon, dns-prefetch, subresource, prefetch and prerender.
-class LinkLoader : public ResourceOwner<Resource, ResourceClient>, public PrerenderClient {
+class LinkLoader FINAL : public ResourceOwner<Resource, ResourceClient>, public PrerenderClient {
 
 public:
     explicit LinkLoader(LinkLoaderClient*);
     virtual ~LinkLoader();
 
     // from ResourceClient
-    virtual void notifyFinished(Resource*);
+    virtual void notifyFinished(Resource*) OVERRIDE;
 
     // from PrerenderClient
     virtual void didStartPrerender() OVERRIDE;