ash: Minor cleanup, move more files from launcher to shelf.

ash/launcher/overflow_button.h

-// Copyright (c) 2012 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_LAUNCHER_OVERFLOW_BUTTON_H_
-#define ASH_LAUNCHER_OVERFLOW_BUTTON_H_
-
-#include "ash/shelf/shelf_types.h"
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "ui/gfx/image/image_skia.h"
-#include "ui/views/controls/button/custom_button.h"
-
-namespace ash {
-namespace internal {
-
-// Launcher overflow chevron button.
-class OverflowButton : public views::CustomButton {
- public:
-  explicit OverflowButton(views::ButtonListener* listener);
-  virtual ~OverflowButton();
-
-  void OnShelfAlignmentChanged();
-
- private:
-  void PaintBackground(gfx::Canvas* canvas, int alpha);
-
-  // views::View overrides:
-  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
-
-  // Left and right images are rotations of bottom_image and are
-  // owned by the overflow button.
-  gfx::ImageSkia left_image_;
-  gfx::ImageSkia right_image_;
-  // Bottom image is owned by the resource bundle.
-  const gfx::ImageSkia* bottom_image_;
-
-  DISALLOW_COPY_AND_ASSIGN(OverflowButton);
-};
-
-}  // namespace internal
-}  // namespace ash
-
-#endif  // ASH_LAUNCHER_OVERFLOW_BUTTON_H_