Delete the GTK+ port of Chrome.

chrome/browser/extensions/api/tabs/windows_event_router.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 CHROME_BROWSER_EXTENSIONS_API_TABS_WINDOWS_EVENT_ROUTER_H_
 #define CHROME_BROWSER_EXTENSIONS_API_TABS_WINDOWS_EVENT_ROUTER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/extensions/window_controller_list_observer.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #if defined(TOOLKIT_VIEWS)
 #include "ui/views/focus/widget_focus_manager.h"
-#elif defined(TOOLKIT_GTK)
-#include "ui/base/x/active_window_watcher_x_observer.h"
 #endif
 
 class Profile;
 
 namespace base {
 class ListValue;
 }
 
 namespace extensions {
 
 // The WindowsEventRouter sends chrome.windows.* events to listeners
 // inside extension process renderers. The router listens to *all* events,
 // but will only route eventes within a profile to extension processes in the
 // same profile.
 class WindowsEventRouter : public WindowControllerListObserver,
 #if defined(TOOLKIT_VIEWS)
                           public views::WidgetFocusChangeListener,
-#elif defined(TOOLKIT_GTK)
-                          public ui::ActiveWindowWatcherXObserver,
 #endif
                           public content::NotificationObserver {
  public:
   explicit WindowsEventRouter(Profile* profile);
   virtual ~WindowsEventRouter();
 
   // WindowControllerListObserver methods:
   virtual void OnWindowControllerAdded(
       WindowController* window_controller) OVERRIDE;
   virtual void OnWindowControllerRemoved(
       WindowController* window) OVERRIDE;
 
 #if defined(TOOLKIT_VIEWS)
   virtual void OnNativeFocusChange(gfx::NativeView focused_before,
                                    gfx::NativeView focused_now) OVERRIDE;
-#elif defined(TOOLKIT_GTK)
-  virtual void ActiveWindowChanged(GdkWindow* active_window) OVERRIDE;
 #endif
 
   // content::NotificationObserver.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // |window_controller| is NULL to indicate a focused window has lost focus.
   void OnActiveWindowChanged(WindowController* window_controller);
 
@@ skipping 15 matching lines @@
   // The currently focused window. We keep this so as to avoid sending multiple
   // windows.onFocusChanged events with the same windowId.
   int focused_window_id_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowsEventRouter);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_TABS_WINDOWS_EVENT_ROUTER_H_