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

Source/bindings/core/v8/V8BindingForTesting.h

 // Copyright (c) 2015 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 V8BindingForTesting_h
 #define V8BindingForTesting_h
 
 #include "bindings/core/v8/DOMWrapperWorld.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "wtf/Forward.h"
 
 #include <v8.h>
 
 namespace blink {
 
 class ScriptStateForTesting : public ScriptState {
 public:
     static PassRefPtr<ScriptStateForTesting> create(v8::Local<v8::Context>, PassRefPtr<DOMWrapperWorld>);
-    virtual ExecutionContext* executionContext() const override;
-    virtual void setExecutionContext(ExecutionContext*) override;
+    ExecutionContext* executionContext() const override;
+    void setExecutionContext(ExecutionContext*) override;
 private:
     ScriptStateForTesting(v8::Local<v8::Context>, PassRefPtr<DOMWrapperWorld>);
     ExecutionContext* m_executionContext;
 };
 
 class V8TestingScope {
 public:
     explicit V8TestingScope(v8::Isolate*);
     ScriptState* scriptState() const;
     v8::Isolate* isolate() const;
     v8::Local<v8::Context> context() const;
     ~V8TestingScope();
 
 private:
     v8::HandleScope m_handleScope;
     v8::Context::Scope m_contextScope;
     RefPtr<ScriptState> m_scriptState;
 };
 
 } // namespace blink
 
 #endif // V8BindingForTesting_h