Remove unused class ShellAppWindowController

extensions/shell/browser/shell_desktop_controller.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 EXTENSIONS_SHELL_BROWSER_SHELL_DESKTOP_CONTROLLER_H_
 #define EXTENSIONS_SHELL_BROWSER_SHELL_DESKTOP_CONTROLLER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 34 matching lines @@
 class CompoundEventFilter;
 class CursorManager;
 class InputMethodEventFilter;
 class UserActivityDetector;
 }
 
 namespace extensions {
 
 class Extension;
 class ShellAppWindow;
-class ShellAppWindowController;
 
 // Handles desktop-related tasks for app_shell.
 class ShellDesktopController : public DesktopController,
                                public aura::client::WindowTreeClient,
 #if defined(OS_CHROMEOS)
                                public chromeos::PowerManagerClient::Observer,
                                public ui::DisplayConfigurator::Observer,
 #endif
                                public aura::WindowTreeHostObserver {
  public:
@@ skipping 67 matching lines @@
 
   // The desktop supports a single app window.
   scoped_ptr<ShellAppWindow> app_window_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellDesktopController);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_SHELL_BROWSER_SHELL_DESKTOP_CONTROLLER_H_