Enable immersive fullscreen on Windows Ash.

ash/frame/custom_frame_view_ash.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 "ash/frame/custom_frame_view_ash.h"
 
 #include "ash/ash_switches.h"
 #include "ash/frame/caption_buttons/frame_caption_button_container_view.h"
 #include "ash/frame/caption_buttons/frame_maximize_button.h"
 #include "ash/frame/caption_buttons/frame_maximize_button_observer.h"
@@ skipping 37 matching lines @@
 // windows.
 class CustomFrameViewAshWindowStateDelegate
     : public ash::wm::WindowStateDelegate,
       public ash::wm::WindowStateObserver,
       public aura::WindowObserver {
  public:
   CustomFrameViewAshWindowStateDelegate(
       ash::wm::WindowState* window_state,
       ash::CustomFrameViewAsh* custom_frame_view)
       : window_state_(NULL) {
-#if defined(OS_CHROMEOS)
-    // TODO(pkotwicz): Investigate if immersive fullscreen can be enabled for
-    // Windows Ash.
     immersive_fullscreen_controller_.reset(
         new ash::ImmersiveFullscreenController);
     custom_frame_view->InitImmersiveFullscreenControllerForView(
         immersive_fullscreen_controller_.get());
 
     // Add a window state observer to exit fullscreen properly in case
     // fullscreen is exited without going through
     // WindowState::ToggleFullscreen(). This is the case when exiting
     // immersive fullscreen via the "Restore" window control.
     // TODO(pkotwicz): This is a hack. Remove ASAP. http://crbug.com/319048
     window_state_ = window_state;
     window_state_->AddObserver(this);
     window_state_->window()->AddObserver(this);
-#endif
   }
   virtual ~CustomFrameViewAshWindowStateDelegate() {
     if (window_state_) {
       window_state_->RemoveObserver(this);
       window_state_->window()->RemoveObserver(this);
     }
   }
  private:
   // Overridden from ash::wm::WindowStateDelegate:
   virtual bool ToggleFullscreen(ash::wm::WindowState* window_state) OVERRIDE {
@@ skipping 424 matching lines @@
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // CustomFrameViewAsh, private:
 
 int CustomFrameViewAsh::NonClientTopBorderHeight() const {
   return frame_->IsFullscreen() ? 0 : header_view_->GetPreferredHeight();
 }
 
 }  // namespace ash