Standardize usage of virtual/override/final in mojo/

mojo/gles2/command_buffer_client_impl.cc

Index: mojo/gles2/command_buffer_client_impl.cc
diff --git a/mojo/gles2/command_buffer_client_impl.cc b/mojo/gles2/command_buffer_client_impl.cc
index a379020a0288b02de1265317e44910a9f109eaec..8ad03d9e62c982b037df08926ca715ba9be4917e 100644
--- a/mojo/gles2/command_buffer_client_impl.cc
+++ b/mojo/gles2/command_buffer_client_impl.cc
@@ -64,10 +64,10 @@ class CommandBufferClientImpl::SyncClientImpl
 
  private:
   // CommandBufferSyncClient methods:
-  virtual void DidInitialize(bool success) override {
+  void DidInitialize(bool success) override {
     initialized_successfully_ = success;
   }
-  virtual void DidMakeProgress(CommandBufferStatePtr state) override {
+  void DidMakeProgress(CommandBufferStatePtr state) override {
     command_buffer_state_ = state.Pass();
   }