Mandoline UI Process: Update namespaces and file names

components/mus/surfaces/surfaces_context_provider_delegate.h

 // 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.
 
 #ifndef COMPONENTS_MUS_SURFACES_SURFACES_CONTEXT_PROVIDER_DELEGATE_H_
 #define COMPONENTS_MUS_SURFACES_SURFACES_CONTEXT_PROVIDER_DELEGATE_H_
 
-namespace surfaces {
+namespace mus {
 
 class SurfacesContextProviderDelegate {
  public:
   virtual void OnVSyncParametersUpdated(int64_t timebase, int64_t interval) = 0;
 
  protected:
   virtual ~SurfacesContextProviderDelegate() {}
 };
 
-}  // namespace surfaces
+}  // namespace mus
 
 #endif  // COMPONENTS_MUS_SURFACES_SURFACES_CONTEXT_PROVIDER_DELEGATE_H_