Introduce WindowStateDelegate::ToggleFullscreen

ash/accelerators/accelerator_commands.cc

 // Copyright 2013 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 "ash/accelerators/accelerator_commands.h"
 
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/wm/window_cycle_controller.h"
 #include "ash/wm/window_state.h"
@@ skipping 19 matching lines @@
   window_state->Minimize();
   return true;
 }
 
 void ToggleMaximized() {
   wm::WindowState* window_state = wm::GetActiveWindowState();
   if (!window_state)
     return;
   // Get out of fullscreen when in fullscreen mode.
   if (window_state->IsFullscreen())
-    Shell::GetInstance()->delegate()->ToggleFullscreen();
+    ToggleFullscreen();
   else
     window_state->ToggleMaximized();
 }
 
+void ToggleFullscreen() {
+  wm::WindowState* window_state = wm::GetActiveWindowState();
+  if (window_state)
+    window_state->ToggleFullscreen();
+}
+
 }  // namespace accelerators
 }  // namespace ash