Revert of Mandoline UI Process: Update namespaces and file names

components/mus/public/cpp/view_tracker.h

Index: components/mus/public/cpp/view_tracker.h
diff --git a/components/mus/public/cpp/view_tracker.h b/components/mus/public/cpp/view_tracker.h
index f551d5a46726fb425e1a3b0da8c50a9e96a52730..39d715bc8fcef32cb6521a7ecf6d07a953044f29 100644
--- a/components/mus/public/cpp/view_tracker.h
+++ b/components/mus/public/cpp/view_tracker.h
@@ -11,7 +11,7 @@
 #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:
@@ -42,6 +42,6 @@
   MOJO_DISALLOW_COPY_AND_ASSIGN(ViewTracker);
 };
 
-}  // namespace mus
+}  // namespace mojo
 
 #endif  // COMPONENTS_MUS_PUBLIC_CPP_VIEW_TRACKER_H_