Cleanup: Remove more dead GTK code.

chrome/browser/ui/panels/panel_manager.cc

 // 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.
 
 #include "chrome/browser/ui/panels/panel_manager.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 119 matching lines @@
         extension_id == std::string("ppleadejekpmccmnpjdimmlfljlkdfej") ||
         extension_id == std::string("eggnbpckecmjlblplehfpjjdhhidfdoj");
   }
 
   return true;
 }
 
 // static
 bool PanelManager::IsPanelStackingEnabled() {
   // Stacked panel mode is not supported in linux-aura.
-#if defined(OS_LINUX) && !defined(TOOLKIT_GTK)
+#if defined(OS_LINUX)
   return false;
 #else
   return true;
 #endif
 }
 
 // static
 bool PanelManager::CanUseSystemMinimize() {
 #if defined(USE_X11) && !defined(OS_CHROMEOS)
   static base::nix::DesktopEnvironment desktop_env =
@@ skipping 409 matching lines @@
 void PanelManager::SetMouseWatcher(PanelMouseWatcher* watcher) {
   panel_mouse_watcher_.reset(watcher);
 }
 
 void PanelManager::OnPanelAnimationEnded(Panel* panel) {
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_PANEL_BOUNDS_ANIMATIONS_FINISHED,
       content::Source<Panel>(panel),
       content::NotificationService::NoDetails());
 }