Mojo: Convert OVERRIDE -> override in various subdirectories of 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 233573fc2835bf789e1b168159b333758e021a57..2d3387b35a84abb5d8f9591704ba18950f7936a9 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 {
+  virtual void DidInitialize(bool success) override {
     initialized_successfully_ = success;
   }
-  virtual void DidMakeProgress(CommandBufferStatePtr state) OVERRIDE {
+  virtual void DidMakeProgress(CommandBufferStatePtr state) override {
     command_buffer_state_ = state.Pass();
   }