Standardize usage of virtual/override/final in chrome/renderer/

chrome/renderer/external_extension.cc

Index: chrome/renderer/external_extension.cc
diff --git a/chrome/renderer/external_extension.cc b/chrome/renderer/external_extension.cc
index 78bce127da35e391ec62d3fec12be2eb0509dcaf..34e05c59cc186dcc844d351df62b16bfdacb80ef 100644
--- a/chrome/renderer/external_extension.cc
+++ b/chrome/renderer/external_extension.cc
@@ -43,7 +43,7 @@ class ExternalExtensionWrapper : public v8::Extension {
 
   // Allows v8's javascript code to call the native functions defined
   // in this class for window.external.
-  virtual v8::Handle<v8::FunctionTemplate> GetNativeFunctionTemplate(
+  v8::Handle<v8::FunctionTemplate> GetNativeFunctionTemplate(
       v8::Isolate* isolate,
       v8::Handle<v8::String> name) override;