Standardize usage of virtual/override/final in content/

content/shell/renderer/test_runner/web_ax_object_proxy.h

Index: content/shell/renderer/test_runner/web_ax_object_proxy.h
diff --git a/content/shell/renderer/test_runner/web_ax_object_proxy.h b/content/shell/renderer/test_runner/web_ax_object_proxy.h
index dd5a843f9e20c932dbc9f4d033f734b9c4b7a063..783f2384228662f31839f7513b811199c920f75f 100644
--- a/content/shell/renderer/test_runner/web_ax_object_proxy.h
+++ b/content/shell/renderer/test_runner/web_ax_object_proxy.h
@@ -32,10 +32,10 @@ class WebAXObjectProxy : public gin::Wrappable<WebAXObjectProxy> {
   static gin::WrapperInfo kWrapperInfo;
 
   WebAXObjectProxy(const blink::WebAXObject& object, Factory* factory);
-  virtual ~WebAXObjectProxy();
+  ~WebAXObjectProxy() override;
 
   // gin::Wrappable:
-  virtual gin::ObjectTemplateBuilder GetObjectTemplateBuilder(
+  gin::ObjectTemplateBuilder GetObjectTemplateBuilder(
       v8::Isolate* isolate) override;
 
   virtual v8::Handle<v8::Object> GetChildAtIndex(unsigned index);
@@ -140,8 +140,8 @@ class RootWebAXObjectProxy : public WebAXObjectProxy {
  public:
   RootWebAXObjectProxy(const blink::WebAXObject&, Factory*);
 
-  virtual v8::Handle<v8::Object> GetChildAtIndex(unsigned index) override;
-  virtual bool IsRoot() const override;
+  v8::Handle<v8::Object> GetChildAtIndex(unsigned index) override;
+  bool IsRoot() const override;
 };
 
 
@@ -151,11 +151,10 @@ class RootWebAXObjectProxy : public WebAXObjectProxy {
 class WebAXObjectProxyList : public WebAXObjectProxy::Factory {
  public:
   WebAXObjectProxyList();
-  virtual ~WebAXObjectProxyList();
+  ~WebAXObjectProxyList() override;
 
   void Clear();
-  virtual v8::Handle<v8::Object> GetOrCreate(
-      const blink::WebAXObject&) override;
+  v8::Handle<v8::Object> GetOrCreate(const blink::WebAXObject&) override;
   v8::Handle<v8::Object> CreateRoot(const blink::WebAXObject&);
 
  private: