Standardize usage of virtual/override/final in mojo/

mojo/public/cpp/application/application_impl.h

Index: mojo/public/cpp/application/application_impl.h
diff --git a/mojo/public/cpp/application/application_impl.h b/mojo/public/cpp/application/application_impl.h
index e5b27be5636b6db7d3337a8cf62668b63a724c17..9e7cfd6dc231154268c1b1ea2d3416edaf966a28 100644
--- a/mojo/public/cpp/application/application_impl.h
+++ b/mojo/public/cpp/application/application_impl.h
@@ -55,7 +55,7 @@ class ApplicationImpl : public InterfaceImpl<Application> {
   ApplicationImpl(ApplicationDelegate* delegate,
                   ScopedMessagePipeHandle shell_handle);
   ApplicationImpl(ApplicationDelegate* delegate, MojoHandle shell_handle);
-  virtual ~ApplicationImpl();
+  ~ApplicationImpl() override;
 
   Shell* shell() const { return shell_.get(); }
 
@@ -80,7 +80,7 @@ class ApplicationImpl : public InterfaceImpl<Application> {
   ScopedMessagePipeHandle UnbindShell();
 
   // Application implementation.
-  virtual void Initialize(Array<String> args) override;
+  void Initialize(Array<String> args) override;
 
  private:
   class ShellPtrWatcher;
@@ -96,8 +96,8 @@ class ApplicationImpl : public InterfaceImpl<Application> {
   static void Terminate();
 
   // Application implementation.
-  virtual void AcceptConnection(const String& requestor_url,
-                                ServiceProviderPtr provider) override;
+  void AcceptConnection(const String& requestor_url,
+                        ServiceProviderPtr provider) override;
 
   typedef std::vector<internal::ServiceRegistry*> ServiceRegistryList;