Revert of Mandoline UI Process: Update namespaces and file names

components/mus/public/cpp/view_tracker.h

 // 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.
 
 #ifndef COMPONENTS_MUS_PUBLIC_CPP_VIEW_TRACKER_H_
 #define COMPONENTS_MUS_PUBLIC_CPP_VIEW_TRACKER_H_
 
 #include <stdint.h>
 #include <set>
 
 #include "components/mus/public/cpp/view_observer.h"
 #include "third_party/mojo/src/mojo/public/cpp/system/macros.h"
 
-namespace mus {
+namespace mojo {
 
 class ViewTracker : public ViewObserver {
  public:
   using Views = std::set<View*>;
 
   ViewTracker();
   ~ViewTracker() override;
 
   // Returns the set of views being observed.
   const std::set<View*>& views() const { return views_; }
@@ skipping 10 matching lines @@
 
   // ViewObserver overrides:
   void OnViewDestroying(View* view) override;
 
  private:
   Views views_;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(ViewTracker);
 };
 
-}  // namespace mus
+}  // namespace mojo
 
 #endif  // COMPONENTS_MUS_PUBLIC_CPP_VIEW_TRACKER_H_