Eliminate ash::internal namespace

ash/wm/window_state.h

Index: ash/wm/window_state.h
diff --git a/ash/wm/window_state.h b/ash/wm/window_state.h
index 8bfb16ef229df1acd525f844d6c0883b95bf434c..4de1f9dd2dc0aba29f5e1ac3629cf2a947368781 100644
--- a/ash/wm/window_state.h
+++ b/ash/wm/window_state.h
@@ -24,10 +24,8 @@ class Rect;
 }
 
 namespace ash {
-namespace internal {
 class WorkspaceLayoutManager;
 class MaximizeModeWindowState;
-}
 
 namespace wm {
 class WindowStateDelegate;
@@ -296,7 +294,7 @@ class ASH_EXPORT WindowState : public aura::WindowObserver {
 
  private:
   friend class DefaultState;
-  friend class ash::internal::MaximizeModeWindowState;
+  friend class ash::MaximizeModeWindowState;
   FRIEND_TEST_ALL_PREFIXES(WindowAnimationsTest, CrossFadeToBounds);
 
   WindowStateDelegate* delegate() { return delegate_.get(); }