Standardize usage of virtual/override/final in mojo/

mojo/apps/js/content_handler_main.cc

Index: mojo/apps/js/content_handler_main.cc
diff --git a/mojo/apps/js/content_handler_main.cc b/mojo/apps/js/content_handler_main.cc
index 1edf10dfe814888668b2d3a3aefde90be96a2e5c..6c6a0a8414c6eebf87c5253876f4549ee69859a8 100644
--- a/mojo/apps/js/content_handler_main.cc
+++ b/mojo/apps/js/content_handler_main.cc
@@ -21,13 +21,12 @@ class ContentHandlerApplicationDelegateImpl : public ApplicationDelegateImpl {
   }
 
  private:
-  virtual void Initialize(ApplicationImpl* app) override {
+  void Initialize(ApplicationImpl* app) override {
     base::i18n::InitializeICU();
     ApplicationDelegateImpl::Initialize(app);
   }
 
-  virtual bool ConfigureIncomingConnection(
-      ApplicationConnection* connection) override {
+  bool ConfigureIncomingConnection(ApplicationConnection* connection) override {
     connection->AddService(&content_handler_factory_);
     return true;
   }