Remove non-MD code for IME tray and tray menu.

ash/common/system/chromeos/ime_menu/ime_menu_tray.h

 // Copyright 2016 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 ASH_COMMON_SYSTEM_CHROMEOS_IME_MENU_IME_MENU_TRAY_H_
 #define ASH_COMMON_SYSTEM_CHROMEOS_IME_MENU_IME_MENU_TRAY_H_
 
 #include "ash/ash_export.h"
 #include "ash/common/system/chromeos/virtual_keyboard/virtual_keyboard_observer.h"
 #include "ash/common/system/ime/ime_observer.h"
@@ skipping 41 matching lines @@
   // Returns true if the menu should show emoji, handwriting and voice buttons
   // on the bottom. Otherwise, the menu will show a 'Customize...' bottom row
   // for non-MD UI, and a Settings button in the title row for MD.
   bool ShouldShowEmojiHandwritingVoiceButtons() const;
 
   // Returns whether the virtual keyboard toggle should be shown in shown in the
   // opt-in IME menu.
   bool ShouldShowKeyboardToggle() const;
 
   // TrayBackgroundView:
-  void SetShelfAlignment(ShelfAlignment alignment) override;
   base::string16 GetAccessibleNameForTray() override;
   void HideBubbleWithView(const views::TrayBubbleView* bubble_view) override;
   void ClickedOutsideBubble() override;
   bool PerformAction(const ui::Event& event) override;
 
   // IMEObserver:
   void OnIMERefresh() override;
   void OnIMEMenuActivationChanged(bool is_activated) override;
 
   // views::TrayBubbleView::Delegate:
@@ skipping 36 matching lines @@
   bool should_block_shelf_auto_hide_;
   bool keyboard_suppressed_;
   bool show_bubble_after_keyboard_hidden_;
 
   DISALLOW_COPY_AND_ASSIGN(ImeMenuTray);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_CHROMEOS_IME_MENU_IME_MENU_TRAY_H_