Converts chrome to aura-mus

chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.h

Index: chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.h
diff --git a/chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.h b/chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.h
index 48b4bc43146f38445054fd59760c91f5f1344254..bdd84f790a5d53e2b0c9d783b00dc3ea49bfb2bf 100644
--- a/chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.h
+++ b/chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.h
@@ -20,10 +20,6 @@
 class TabIconView;
 class WebAppLeftHeaderView;
 
-namespace ui {
-class Window;
-}
-
 class BrowserNonClientFrameViewMus : public BrowserNonClientFrameView,
                                      public TabIconViewModel,
                                      public TabStripObserver {
@@ -72,9 +68,7 @@ class BrowserNonClientFrameViewMus : public BrowserNonClientFrameView,
   void UpdateProfileIcons() override;
 
  private:
-  ui::Window* mus_window();
-
-  // Resets the client area on the ui::Window.
+  // Resets the client area of the WindowTreeHostMus.
   void UpdateClientArea();
 
   // TabStripObserver: