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

Source/core/loader/WorkerThreadableLoader.h

Index: Source/core/loader/WorkerThreadableLoader.h
diff --git a/Source/core/loader/WorkerThreadableLoader.h b/Source/core/loader/WorkerThreadableLoader.h
index 1547152c57810961f862deef4f2e861adbead96c..7991f822e7db6175f2caedbbc722ff72e4dec0a3 100644
--- a/Source/core/loader/WorkerThreadableLoader.h
+++ b/Source/core/loader/WorkerThreadableLoader.h
@@ -59,11 +59,11 @@ namespace blink {
             return adoptRef(new WorkerThreadableLoader(workerGlobalScope, clientWrapper, clientBridge, request, options, resourceLoaderOptions));
         }
 
-        virtual ~WorkerThreadableLoader();
+        ~WorkerThreadableLoader() override;
 
-        virtual void overrideTimeout(unsigned long timeout) override;
+        void overrideTimeout(unsigned long timeout) override;
 
-        virtual void cancel() override;
+        void cancel() override;
 
     private:
         // Creates a loader on the main thread and bridges communication between
@@ -99,21 +99,21 @@ namespace blink {
 
             // All executed on the main thread.
             void mainThreadDestroy(ExecutionContext*);
-            virtual ~MainThreadBridge();
+            ~MainThreadBridge() override;
 
             void mainThreadCreateLoader(PassOwnPtr<CrossThreadResourceRequestData>, ThreadableLoaderOptions, ResourceLoaderOptions, const ReferrerPolicy, const String& outgoingReferrer, ExecutionContext*);
             void mainThreadOverrideTimeout(unsigned long timeoutMilliseconds, ExecutionContext*);
             void mainThreadCancel(ExecutionContext*);
-            virtual void didSendData(unsigned long long bytesSent, unsigned long long totalBytesToBeSent) override;
-            virtual void didReceiveResponse(unsigned long identifier, const ResourceResponse&, PassOwnPtr<WebDataConsumerHandle>) override;
-            virtual void didReceiveData(const char*, unsigned dataLength) override;
-            virtual void didDownloadData(int dataLength) override;
-            virtual void didReceiveCachedMetadata(const char*, int dataLength) override;
-            virtual void didFinishLoading(unsigned long identifier, double finishTime) override;
-            virtual void didFail(const ResourceError&) override;
-            virtual void didFailAccessControlCheck(const ResourceError&) override;
-            virtual void didFailRedirectCheck() override;
-            virtual void didReceiveResourceTiming(const ResourceTimingInfo&) override;
+            void didSendData(unsigned long long bytesSent, unsigned long long totalBytesToBeSent) override;
+            void didReceiveResponse(unsigned long identifier, const ResourceResponse&, PassOwnPtr<WebDataConsumerHandle>) override;
+            void didReceiveData(const char*, unsigned dataLength) override;
+            void didDownloadData(int dataLength) override;
+            void didReceiveCachedMetadata(const char*, int dataLength) override;
+            void didFinishLoading(unsigned long identifier, double finishTime) override;
+            void didFail(const ResourceError&) override;
+            void didFailAccessControlCheck(const ResourceError&) override;
+            void didFailRedirectCheck() override;
+            void didReceiveResourceTiming(const ResourceTimingInfo&) override;
 
             // Only to be used on the main thread.
             RefPtr<ThreadableLoader> m_mainThreadLoader;