Revert of Mandoline UI Process: Update namespaces and file names

components/mus/gles2/gpu_state.cc

 // 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.
 //
 
 #include "components/mus/gles2/gpu_state.h"
 
-namespace mus {
+namespace gles2 {
 
 GpuState::GpuState()
     : control_thread_("gpu_command_buffer_control"),
       sync_point_manager_(new gpu::SyncPointManager(true)),
       share_group_(new gfx::GLShareGroup),
       mailbox_manager_(new gpu::gles2::MailboxManagerImpl) {
   control_thread_.Start();
 }
 
 GpuState::~GpuState() {}
 
 void GpuState::StopControlThread() {
   control_thread_.Stop();
 }
 
-}  // namespace mus
+}  // namespace gles2