Remove Widget::OnRootViewLayout().

ui/views/mus/native_widget_mus.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_MUS_NATIVE_WIDGET_MUS_H_
 #define UI_VIEWS_MUS_NATIVE_WIDGET_MUS_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 174 matching lines @@
   Widget::MoveLoopResult RunMoveLoop(
       const gfx::Vector2d& drag_offset,
       Widget::MoveLoopSource source,
       Widget::MoveLoopEscapeBehavior escape_behavior) override;
   void EndMoveLoop() override;
   void SetVisibilityChangedAnimationsEnabled(bool value) override;
   void SetVisibilityAnimationDuration(const base::TimeDelta& duration) override;
   void SetVisibilityAnimationTransition(
       Widget::VisibilityTransition transition) override;
   ui::NativeTheme* GetNativeTheme() const override;
-  void OnRootViewLayout() override;
   bool IsTranslucentWindowOpacitySupported() const override;
   void OnSizeConstraintsChanged() override;
   void RepostNativeEvent(gfx::NativeEvent native_event) override;
   std::string GetName() const override;
 
   // Overridden from aura::WindowDelegate:
   gfx::Size GetMinimumSize() const override;
   gfx::Size GetMaximumSize() const override;
   void OnBoundsChanged(const gfx::Rect& old_bounds,
                        const gfx::Rect& new_bounds) override;
@@ skipping 101 matching lines @@
   std::unique_ptr<InputMethodMus> input_method_;
 
   base::WeakPtrFactory<NativeWidgetMus> close_widget_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeWidgetMus);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_MUS_NATIVE_WIDGET_MUS_H_