Revert of Mandoline UI Process: Update namespaces and file names

components/mus/public/cpp/view_tracker.cc

 // Copyright 2014 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/public/cpp/view_tracker.h"
 
-namespace mus {
+namespace mojo {
 
 ViewTracker::ViewTracker() {}
 
 ViewTracker::~ViewTracker() {
   for (Views::iterator i = views_.begin(); i != views_.end(); ++i)
     (*i)->RemoveObserver(this);
 }
 
 void ViewTracker::Add(View* view) {
   if (views_.count(view))
@@ skipping 12 matching lines @@
 
 bool ViewTracker::Contains(View* view) {
   return views_.count(view) > 0;
 }
 
 void ViewTracker::OnViewDestroying(View* view) {
   DCHECK_GT(views_.count(view), 0u);
   Remove(view);
 }
 
-}  // namespace mus
+}  // namespace mojo