Mandoline UI Process: Update namespaces and file names

components/mus/surfaces/surfaces_output_surface.h

Index: components/mus/surfaces/surfaces_output_surface.h
diff --git a/components/mus/surfaces/surfaces_output_surface.h b/components/mus/surfaces/surfaces_output_surface.h
index ea05a505b45776a3c11c7bdf28e8489746f68966..3bd62df0691fc179fb9202c900a63b57bc5a76e4 100644
--- a/components/mus/surfaces/surfaces_output_surface.h
+++ b/components/mus/surfaces/surfaces_output_surface.h
@@ -7,7 +7,7 @@
 
 #include "cc/output/output_surface.h"
 
-namespace surfaces {
+namespace mus {
 
 // An OutputSurface implementation that directly draws and
 // swaps to an actual GL surface.
@@ -24,6 +24,6 @@ class DirectOutputSurface : public cc::OutputSurface {
   base::WeakPtrFactory<DirectOutputSurface> weak_ptr_factory_;
 };
 
-}  // namespace surfaces
+}  // namespace mus
 
 #endif  // COMPONENTS_MUS_SURFACES_SURFACES_OUTPUT_SURFACE_H_