Fix virtual/override/final usage in Source/core/{fetch,loader,streams,xmlhttprequest}/.

Source/core/fetch/RawResource.h

Index: Source/core/fetch/RawResource.h
diff --git a/Source/core/fetch/RawResource.h b/Source/core/fetch/RawResource.h
index b4438a113cc0c6e532c7b574477d446e70191db2..1dae4e65784d3cf59c40472d712ee3e4b03aa7a8 100644
--- a/Source/core/fetch/RawResource.h
+++ b/Source/core/fetch/RawResource.h
@@ -98,9 +98,9 @@ inline RawResource* toRawResource(const ResourcePtr<Resource>& resource)
 
 class CORE_EXPORT RawResourceClient : public ResourceClient {
 public:
-    virtual ~RawResourceClient() { }
+    ~RawResourceClient() override {}
     static ResourceClientType expectedType() { return RawResourceType; }
-    virtual ResourceClientType resourceClientType() const override final { return expectedType(); }
+    ResourceClientType resourceClientType() const final { return expectedType(); }
 
     virtual void dataSent(Resource*, unsigned long long /* bytesSent */, unsigned long long /* totalBytesToBeSent */) { }
     virtual void responseReceived(Resource*, const ResourceResponse&, PassOwnPtr<WebDataConsumerHandle>) { }