Fix virtual/override/final usage in Source/modules/.

Source/modules/fetch/Body.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef Body_h
 #define Body_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptWrappable.h"
@@ skipping 31 matching lines @@
         ResponseAsFormData,
         ResponseAsJSON,
         ResponseAsText
     };
     enum LockBodyOption {
         LockBodyOptionNone,
         // Setting "body passed" flag in addition to acquiring a lock.
         PassBody,
     };
     explicit Body(ExecutionContext*);
-    virtual ~Body() { }
+    ~Body() override { }
 
     ScriptPromise arrayBuffer(ScriptState*);
     ScriptPromise blob(ScriptState*);
     ScriptPromise formData(ScriptState*);
     ScriptPromise json(ScriptState*);
     ScriptPromise text(ScriptState*);
     ReadableByteStream* body();
 
     bool bodyUsed() const;
     void lockBody(LockBodyOption = LockBodyOptionNone);
 
     // Creates a DrainingBodyStreamBuffer to access body data.
     // Returns nullptr if underlying BodyStreamBuffer is null.
     PassOwnPtr<DrainingBodyStreamBuffer> createDrainingStream();
 
     // ActiveDOMObject override.
-    virtual bool hasPendingActivity() const override;
+    bool hasPendingActivity() const override;
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
     // Sets |m_stream| to a newly created stream from |buffer|.
     // |buffer| can be null.
     // This is called when the underlying buffer is set/modified.
     // TODO(hiroshige): Merge FetchRequest/ResponseData::buffer() and
     // integrate Body::setBody(), Request/Response::refreshBody(),
     // FetchRequestData::setBuffer() and
@@ skipping 19 matching lines @@
     bool m_bodyUsed;
     ResponseType m_responseType;
     RefPtrWillBeMember<ScriptPromiseResolver> m_resolver;
     Member<ReadableStreamSource> m_streamSource;
     Member<ReadableByteStream> m_stream;
 };
 
 } // namespace blink
 
 #endif // Body_h