Replaces ::ui:: with ui:: in ash

ash/mus/disconnected_app_handler.h

Index: ash/mus/disconnected_app_handler.h
diff --git a/ash/mus/disconnected_app_handler.h b/ash/mus/disconnected_app_handler.h
index fb722c827377778445b3cc454ffac07bd50afcf4..8a1abef7c9c5c1da54532ee4c8cb05fec1687550 100644
--- a/ash/mus/disconnected_app_handler.h
+++ b/ash/mus/disconnected_app_handler.h
@@ -13,14 +13,14 @@ namespace mus {
 
 // Tracks ui::Windows for when they get disconnected from the embedded app.
 // Destroys the window upon disconnection.
-class DisconnectedAppHandler : public ::ui::WindowTracker {
+class DisconnectedAppHandler : public ui::WindowTracker {
  public:
-  explicit DisconnectedAppHandler(::ui::Window* root_window);
+  explicit DisconnectedAppHandler(ui::Window* root_window);
   ~DisconnectedAppHandler() override;
 
  private:
   // ui::WindowObserver:
-  void OnWindowEmbeddedAppDisconnected(::ui::Window* window) override;
+  void OnWindowEmbeddedAppDisconnected(ui::Window* window) override;
   void OnTreeChanging(const TreeChangeParams& params) override;
 
   DISALLOW_COPY_AND_ASSIGN(DisconnectedAppHandler);