Standardize usage of virtual/override/final in extensions/

extensions/browser/api_test_utils.cc

Index: extensions/browser/api_test_utils.cc
diff --git a/extensions/browser/api_test_utils.cc b/extensions/browser/api_test_utils.cc
index 4496dcb0a35e684050f70e83d6ab939a955bb93c..23c0efeaa1832f27c9ed75be78afbe74f255bb01 100644
--- a/extensions/browser/api_test_utils.cc
+++ b/extensions/browser/api_test_utils.cc
@@ -22,7 +22,7 @@ class TestFunctionDispatcherDelegate
     : public ExtensionFunctionDispatcher::Delegate {
  public:
   TestFunctionDispatcherDelegate() {}
-  virtual ~TestFunctionDispatcherDelegate() {}
+  ~TestFunctionDispatcherDelegate() override {}
 
   // NULL implementation.
  private:
@@ -60,9 +60,9 @@ class SendResponseDelegate
     return *response_.get();
   }
 
-  virtual void OnSendResponse(UIThreadExtensionFunction* function,
-                              bool success,
-                              bool bad_message) override {
+  void OnSendResponse(UIThreadExtensionFunction* function,
+                      bool success,
+                      bool bad_message) override {
     ASSERT_FALSE(bad_message);
     ASSERT_FALSE(HasResponse());
     response_.reset(new bool);