Remove implementation of Panels on OSes other than ChromeOS.

chrome/browser/ui/views/panels/x11_panel_resizer.h

-// Copyright 2014 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_UI_VIEWS_PANELS_X11_PANEL_RESIZER_H_
-#define CHROME_BROWSER_UI_VIEWS_PANELS_X11_PANEL_RESIZER_H_
-
-#include "base/macros.h"
-#include "ui/events/event_handler.h"
-#include "ui/gfx/geometry/point.h"
-
-namespace aura {
-class Window;
-}
-
-class Panel;
-
-// EventHandler which implements special handling for resizing panels. Panels
-// should use X11PanelResizer instead of X11WindowEventFilter.
-// When resizing a panel:
-// - The panel bounds should update in sync with the user's mouse movement
-//   during the resize operation.
-// - The layout of all of the panels should be updated once the resize operation
-//   completes.
-// X11PanelResizer does not hand off resizing to the window manager because it
-// is not possible to determine when the window manager has finished resizing.
-class X11PanelResizer : public ui::EventHandler {
- public:
-  X11PanelResizer(Panel* panel, aura::Window* window);
-  ~X11PanelResizer() override;
-
- private:
-  enum ResizeState {
-    NOT_RESIZING,
-
-    // The user has clicked on one of the panel's edges.
-    RESIZE_CAN_START,
-
-    // The user has dragged one of the panel's edges far enough for resizing to
-    // begin.
-    RESIZE_IN_PROGRESS
-  };
-
-  // Called as a result of ET_MOUSE_PRESSED.
-  void OnMousePressed(ui::MouseEvent* event);
-
-  // Called as a result of ET_MOUSE_DRAGGED.
-  void OnMouseDragged(ui::MouseEvent* event);
-
-  // Stops the resize operation if one is in progress. Consumes |event| if it
-  // is not NULL and the resize operation was stopped.
-  void StopResizing(ui::MouseEvent* event, bool canceled);
-
-  // ui::EventHandler:
-  void OnMouseEvent(ui::MouseEvent* event) override;
-
-  // The panel being resized.
-  Panel* panel_;
-
-  // |panel|'s window.
-  aura::Window* window_;
-
-  ResizeState resize_state_;
-
-  // The edge that the user is resizing.
-  int resize_component_;
-
-  // The location of the mouse click on the window border.
-  gfx::Point initial_press_location_in_screen_;
-
-  DISALLOW_COPY_AND_ASSIGN(X11PanelResizer);
-};
-
-#endif  // CHROME_BROWSER_UI_VIEWS_PANELS_X11_PANEL_RESIZER_H_