Revert of Mandoline UI Process: Update namespaces and file names

components/mus/gles2/gpu_memory_tracker.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_memory_tracker.h"
 
-namespace mus {
+namespace gles2 {
 
 GpuMemoryTracker::GpuMemoryTracker() {}
 
 void GpuMemoryTracker::TrackMemoryAllocatedChange(
     size_t old_size,
     size_t new_size,
     gpu::gles2::MemoryTracker::Pool pool) {}
 
 bool GpuMemoryTracker::EnsureGPUMemoryAvailable(size_t size_needed) {
   return true;
 }
 
 uint64_t GpuMemoryTracker::ClientTracingId() const {
   return 0u;
 }
 
 int GpuMemoryTracker::ClientId() const {
   return 0;
 }
 
 GpuMemoryTracker::~GpuMemoryTracker() {}
 
-}  // namespace mus
+}  // namespace gles2