Standardize usage of virtual/override/final in extensions/

extensions/renderer/script_context.h

Index: extensions/renderer/script_context.h
diff --git a/extensions/renderer/script_context.h b/extensions/renderer/script_context.h
index 5c40dfb67951761eaffb43cf1cd19ef2667dad9a..8d6f853e9e5ca43832cfee2092db26b3e7f4ee8e 100644
--- a/extensions/renderer/script_context.h
+++ b/extensions/renderer/script_context.h
@@ -38,7 +38,7 @@ class ScriptContext : public RequestSender::Source, public gin::Runner {
                 Feature::Context context_type,
                 const Extension* effective_extension,
                 Feature::Context effective_context_type);
-  virtual ~ScriptContext();
+  ~ScriptContext() override;
 
   // Clears the WebFrame for this contexts and invalidates the associated
   // ModuleSystem.
@@ -133,21 +133,21 @@ class ScriptContext : public RequestSender::Source, public gin::Runner {
                                       bool match_about_blank);
 
   // RequestSender::Source implementation.
-  virtual ScriptContext* GetContext() override;
-  virtual void OnResponseReceived(const std::string& name,
-                                  int request_id,
-                                  bool success,
-                                  const base::ListValue& response,
-                                  const std::string& error) override;
+  ScriptContext* GetContext() override;
+  void OnResponseReceived(const std::string& name,
+                          int request_id,
+                          bool success,
+                          const base::ListValue& response,
+                          const std::string& error) override;
 
   // gin::Runner overrides.
-  virtual void Run(const std::string& source,
-                   const std::string& resource_name) override;
-  virtual v8::Handle<v8::Value> Call(v8::Handle<v8::Function> function,
-                                     v8::Handle<v8::Value> receiver,
-                                     int argc,
-                                     v8::Handle<v8::Value> argv[]) override;
-  virtual gin::ContextHolder* GetContextHolder() override;
+  void Run(const std::string& source,
+           const std::string& resource_name) override;
+  v8::Handle<v8::Value> Call(v8::Handle<v8::Function> function,
+                             v8::Handle<v8::Value> receiver,
+                             int argc,
+                             v8::Handle<v8::Value> argv[]) override;
+  gin::ContextHolder* GetContextHolder() override;
 
  protected:
   // The v8 context the bindings are accessible to.