Remove the no-longer used TabButtonGtk class.

chrome/browser/gtk/tabs/tab_button_gtk.h

-// Copyright (c) 2009 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 CHROME_BROWSER_GTK_TABS_TAB_BUTTON_GTK_H_
-#define CHROME_BROWSER_GTK_TABS_TAB_BUTTON_GTK_H_
-
-#include <gdk/gdk.h>
-
-#include "base/gfx/rect.h"
-#include "chrome/browser/tabs/tab_strip_model.h"
-#include "chrome/common/gfx/chrome_canvas.h"
-#include "skia/include/SkBitmap.h"
-
-///////////////////////////////////////////////////////////////////////////////
-// TabButtonGtk
-//
-//  Performs hit-testing and rendering of a Tab button.
-//
-class TabButtonGtk {
- public:
-  // Possible button states
-  enum ButtonState {
-    BS_NORMAL,
-    BS_HOT,
-    BS_PUSHED,
-    BS_COUNT
-  };
-
-  class Delegate {
-   public:
-    // Creates a clickable region of the button's visual representation used
-    // for hit-testing.  Caller is responsible for destroying the region.  If
-    // NULL is returned, the bounds of the button will be used for hit-testing.
-    virtual GdkRegion* MakeRegionForButton(
-        const TabButtonGtk* button) const = 0;
-
-    // Sent when the user activates the button, which is defined as a press
-    // and release of a mouse click over the button.
-    virtual void OnButtonActivate(const TabButtonGtk* button) = 0;
-  };
-
-  explicit TabButtonGtk(Delegate* delegate);
-  virtual ~TabButtonGtk();
-
-  // Returns the bounds of the button.
-  int x() const { return bounds_.x(); }
-  int y() const { return bounds_.y(); }
-  int width() const { return bounds_.width(); }
-  int height() const { return bounds_.height(); }
-
-  const gfx::Rect& bounds() const { return bounds_; }
-
-  // Sets the bounds of the button.
-  void set_bounds(const gfx::Rect& bounds) { bounds_ = bounds; }
-
-  // Checks whether |point| is inside the bounds of the button.
-  bool IsPointInBounds(const gfx::Point& point);
-
-  // Sent by the tabstrip when the mouse moves within this button.  Mouse state
-  // is in |event|.  Returns true if the tabstrip needs to be redrawn as a
-  // result of the motion.
-  bool OnMotionNotify(GdkEventMotion* event);
-
-  // Sent by the tabstrip when the mouse clicks within this button.  Returns
-  // true if the tabstrip needs to be redrawn as a result of the click.
-  bool OnMousePress();
-
-  // Sent by the tabstrip when the mouse click is released.
-  void OnMouseRelease();
-
-  // Sent by the tabstrip when the mouse leaves this button.  Returns true
-  // if the tabstrip needs to be redrawn as a result of the movement.
-  bool OnLeaveNotify();
-
-  // Paints the Tab button into |canvas|.
-  void Paint(ChromeCanvasPaint* canvas);
-
-  // Sets the image the button should use for the provided state.
-  void SetImage(ButtonState state, SkBitmap* bitmap);
-
- private:
-  // When the tab animation completes, we send the widget a message to
-  // simulate a mouse moved event at the current mouse position. This tickles
-  // the button to show the "hot" state.
-  void HighlightTabButton();
-
-  // The images used to render the different states of this button.
-  SkBitmap images_[BS_COUNT];
-
-  // The current state of the button.
-  ButtonState state_;
-
-  // The current bounds of the button.
-  gfx::Rect bounds_;
-
-  // Set if the mouse is pressed anywhere inside the button.
-  bool mouse_pressed_;
-
-  // Delegate to receive button messages.
-  Delegate* delegate_;
-
-  DISALLOW_COPY_AND_ASSIGN(TabButtonGtk);
-};
-
-#endif  // CHROME_BROWSER_GTK_TABS_TAB_BUTTON_GTK_H_