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

Source/core/fetch/ImageResourceClient.h

Index: Source/core/fetch/ImageResourceClient.h
diff --git a/Source/core/fetch/ImageResourceClient.h b/Source/core/fetch/ImageResourceClient.h
index 900550e618ebf884bdce0d4391b967df5fc69dcc..b242fc884291503ed5433dbe3116e2fc28a9f464 100644
--- a/Source/core/fetch/ImageResourceClient.h
+++ b/Source/core/fetch/ImageResourceClient.h
@@ -34,7 +34,7 @@ class ImageResourceClient : public ResourceClient {
 public:
     virtual ~ImageResourceClient() { }
     static ResourceClientType expectedType() { return ImageType; }
-    virtual ResourceClientType resourceClientType() const { return expectedType(); }
+    virtual ResourceClientType resourceClientType() const OVERRIDE FINAL { return expectedType(); }
 
     // Called whenever a frame of an image changes, either because we got more data from the network or
     // because we are animating. If not null, the IntRect is the changed rect of the image.