Revert of Mandoline UI Process: Update namespaces and file names

components/mus/gles2/command_buffer_impl_observer.h

 // 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 {
+namespace gles2 {
 
 class CommandBufferImplObserver {
  public:
   virtual void OnCommandBufferImplDestroyed() = 0;
 
  protected:
   ~CommandBufferImplObserver() {}
 };
 
-}  // namespace mus
+}  // namespace gles2
 
 #endif  // COMPONENTS_GLES2_COMMAND_BUFFER_IMPL_OBSERVER_H_