Add chrome/browser/extensions to "GN check"

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 <map>
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/scoped_observer.h"
 #include "build/build_config.h"
 #include "chrome/browser/extensions/window_controller_list_observer.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "extensions/browser/app_window/app_window_registry.h"
 #include "extensions/browser/extension_event_histogram_value.h"
 
-#if !defined(OS_MACOSX)
-#include "ui/views/focus/widget_focus_manager.h"
+#if defined(TOOLKIT_VIEWS) && !defined(OS_MACOSX)
+#include "ui/views/focus/widget_focus_manager.h"  // nogncheck
 #endif
 
 class Profile;
 
 namespace base {
 class ListValue;
 }
 
 namespace extensions {
 
 class AppWindow;
 class AppWindowController;
 class WindowControllerList;
 
 // The WindowsEventRouter sends chrome.windows.* events to listeners
 // inside extension process renderers. The router listens to *all* events,
 // but will only route events within a profile to extension processes in the
 // same profile.
 class WindowsEventRouter : public AppWindowRegistry::Observer,
                            public WindowControllerListObserver,
-#if !defined(OS_MACOSX)
+#if defined(TOOLKIT_VIEWS) && !defined(OS_MACOSX)
                            public views::WidgetFocusChangeListener,
 #endif
                            public content::NotificationObserver {
  public:
   explicit WindowsEventRouter(Profile* profile);
   ~WindowsEventRouter() override;
 
   // |window_controller| is NULL to indicate a focused window has lost focus.
   void OnActiveWindowChanged(WindowController* window_controller);
 
  private:
   // extensions::AppWindowRegistry::Observer:
   void OnAppWindowAdded(extensions::AppWindow* app_window) override;
   void OnAppWindowRemoved(extensions::AppWindow* app_window) override;
   void OnAppWindowActivated(extensions::AppWindow* app_window) override;
 
   // WindowControllerListObserver methods:
   void OnWindowControllerAdded(WindowController* window_controller) override;
   void OnWindowControllerRemoved(WindowController* window) override;
 
-#if !defined(OS_MACOSX)
+#if defined(TOOLKIT_VIEWS) && !defined(OS_MACOSX)
   void OnNativeFocusChanged(gfx::NativeView focused_now) override;
 #endif
 
   // content::NotificationObserver.
   void Observe(int type,
                const content::NotificationSource& source,
                const content::NotificationDetails& details) override;
 
   void DispatchEvent(events::HistogramValue histogram_value,
                      const std::string& event_name,
@@ skipping 27 matching lines @@
   // Observed WindowControllerList.
   ScopedObserver<WindowControllerList, WindowControllerListObserver>
       observed_controller_list_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowsEventRouter);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_TABS_WINDOWS_EVENT_ROUTER_H_