Make LogoutButtonTray a regular View

ash/system/palette/palette_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_SYSTEM_PALETTE_PALETTE_TRAY_H_
 #define ASH_SYSTEM_PALETTE_PALETTE_TRAY_H_
 
-#include <map>
 #include <memory>
 
 #include "ash/ash_export.h"
 #include "ash/palette_delegate.h"
 #include "ash/session/session_state_observer.h"
 #include "ash/shell_observer.h"
 #include "ash/system/palette/palette_tool_manager.h"
 #include "ash/system/tray/tray_background_view.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 32 matching lines @@
   // SessionStateObserver:
   void SessionStateChanged(session_manager::SessionState state) override;
 
   // ShellObserver:
   void OnLockStateChanged(bool locked) override;
 
   // TrayBackgroundView:
   void ClickedOutsideBubble() override;
   base::string16 GetAccessibleNameForTray() override;
   void HideBubbleWithView(const views::TrayBubbleView* bubble_view) override;
-  void SetShelfAlignment(ShelfAlignment alignment) override;
   void AnchorUpdated() override;
   void Initialize() override;
 
   // PaletteToolManager::Delegate:
   void HidePalette() override;
   void HidePaletteImmediately() override;
   void RecordPaletteOptionsUsage(PaletteTrayOptions option) override;
   void RecordPaletteModeCancellation(PaletteModeCancelType type) override;
 
   // Returns true if the shelf should not autohide.
@@ skipping 63 matching lines @@
   int num_actions_in_bubble_ = 0;
 
   base::WeakPtrFactory<PaletteTray> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PaletteTray);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_PALETTE_PALETTE_TRAY_H_