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

Source/core/fetch/CSSStyleSheetResource.h

Index: Source/core/fetch/CSSStyleSheetResource.h
diff --git a/Source/core/fetch/CSSStyleSheetResource.h b/Source/core/fetch/CSSStyleSheetResource.h
index d4c16d0b6fb3d1516b689e6f4d7cb382069d5009..2861bd1f31bf5dad68fa6c5545e3312f2397ca5d 100644
--- a/Source/core/fetch/CSSStyleSheetResource.h
+++ b/Source/core/fetch/CSSStyleSheetResource.h
@@ -44,21 +44,21 @@ public:
 
     static ResourcePtr<CSSStyleSheetResource> fetch(FetchRequest&, ResourceFetcher*);
 
-    virtual ~CSSStyleSheetResource();
+    ~CSSStyleSheetResource() override;
     DECLARE_VIRTUAL_TRACE();
 
     const String sheetText(MIMETypeCheck = MIMETypeCheck::Strict) const;
 
     const AtomicString mimeType() const;
 
-    virtual void didAddClient(ResourceClient*) override;
+    void didAddClient(ResourceClient*) override;
 
     PassRefPtrWillBeRawPtr<StyleSheetContents> restoreParsedStyleSheet(const CSSParserContext&);
     void saveParsedStyleSheet(PassRefPtrWillBeRawPtr<StyleSheetContents>);
 
 protected:
-    virtual bool isSafeToUnlock() const override;
-    virtual void destroyDecodedDataIfPossible() override;
+    bool isSafeToUnlock() const override;
+    void destroyDecodedDataIfPossible() override;
 
 private:
     class CSSStyleSheetResourceFactory : public ResourceFactory {
@@ -74,8 +74,8 @@ private:
     CSSStyleSheetResource(const ResourceRequest&, const String& charset);
 
     bool canUseSheet(MIMETypeCheck) const;
-    virtual void dispose() override;
-    virtual void checkNotify() override;
+    void dispose() override;
+    void checkNotify() override;
 
     String m_decodedSheetText;