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

Source/core/loader/PingLoader.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 44 matching lines @@
 // the load is cancelled and the loader cancels itself.
 //
 // The ping loader is used by audit pings, beacon transmissions and image loads
 // during page unloading.
 //
 class CORE_EXPORT PingLoader : public RefCountedWillBeRefCountedGarbageCollected<PingLoader>, public PageLifecycleObserver, private WebURLLoaderClient {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(PingLoader);
     WTF_MAKE_NONCOPYABLE(PingLoader);
     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(PingLoader);
 public:
-    virtual ~PingLoader();
+    ~PingLoader() override;
 
     enum ViolationReportType {
         ContentSecurityPolicyViolationReport,
         XSSAuditorViolationReport
     };
 
     static void loadImage(LocalFrame*, const KURL&);
     static void sendLinkAuditPing(LocalFrame*, const KURL& pingURL, const KURL& destinationURL);
     static void sendViolationReport(LocalFrame*, const KURL& reportURL, PassRefPtr<FormData> report, ViolationReportType);
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
     PingLoader(LocalFrame*, ResourceRequest&, const FetchInitiatorInfo&, StoredCredentials);
 
     static void start(LocalFrame*, ResourceRequest&, const FetchInitiatorInfo&, StoredCredentials = AllowStoredCredentials);
 
     void dispose();
 
 private:
-    virtual void didReceiveResponse(WebURLLoader*, const WebURLResponse&) override;
-    virtual void didReceiveData(WebURLLoader*, const char*, int, int) override;
-    virtual void didFinishLoading(WebURLLoader*, double, int64_t) override;
-    virtual void didFail(WebURLLoader*, const WebURLError&) override;
+    void didReceiveResponse(WebURLLoader*, const WebURLResponse&) override;
+    void didReceiveData(WebURLLoader*, const char*, int, int) override;
+    void didFinishLoading(WebURLLoader*, double, int64_t) override;
+    void didFail(WebURLLoader*, const WebURLError&) override;
 
     void timeout(Timer<PingLoader>*);
 
     void didFailLoading(Page*);
 
     OwnPtr<WebURLLoader> m_loader;
     Timer<PingLoader> m_timeout;
     String m_url;
     unsigned long m_identifier;
 };
 
 } // namespace blink
 
 #endif // PingLoader_h