mus: Modify mojo command buffer to match current chrome gpu ipc.

components/mus/gles2/command_buffer_impl_observer.h

Index: components/mus/gles2/command_buffer_impl_observer.h
diff --git a/components/mus/gles2/command_buffer_impl_observer.h b/components/mus/gles2/command_buffer_impl_observer.h
deleted file mode 100644
index 6ea42de87627ce2676efbb01942c53d87f18b22d..0000000000000000000000000000000000000000
--- a/components/mus/gles2/command_buffer_impl_observer.h
+++ /dev/null
@@ -1,20 +0,0 @@
-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef COMPONENTS_GLES2_COMMAND_BUFFER_IMPL_OBSERVER_H_
-#define COMPONENTS_GLES2_COMMAND_BUFFER_IMPL_OBSERVER_H_
-
-namespace mus {
-
-class CommandBufferImplObserver {
- public:
-  virtual void OnCommandBufferImplDestroyed() = 0;
-
- protected:
-  ~CommandBufferImplObserver() {}
-};
-
-}  // namespace mus
-
-#endif  // COMPONENTS_GLES2_COMMAND_BUFFER_IMPL_OBSERVER_H_