Move wm/core to wm namespace.

ui/wm/core/wm_state.cc

Index: ui/wm/core/wm_state.cc
diff --git a/ui/wm/core/wm_state.cc b/ui/wm/core/wm_state.cc
index aa2a5efc394423bf9c2d164adc8287d760070b37..afb84c7c92fa17b735fc255b102d3ccbeee15d03 100644
--- a/ui/wm/core/wm_state.cc
+++ b/ui/wm/core/wm_state.cc
@@ -7,8 +7,7 @@
 #include "ui/wm/core/transient_window_controller.h"
 #include "ui/wm/core/transient_window_stacking_client.h"
 
-namespace views {
-namespace corewm {
+namespace wm {
 
 WMState::WMState()
     : window_stacking_client_(new TransientWindowStackingClient),
@@ -27,5 +26,4 @@ WMState::~WMState() {
   }
 }
 
-}  // namespace corewm
-}  // namespace views
+}  // namespace wm