Don't include hidden windows in IsAppWindowRegisteredInAnyProfile.

chrome/browser/apps/app_window_registry_util.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 CHROME_BROWSER_APPS_APP_WINDOW_REGISTRY_UTIL_H_
 #define CHROME_BROWSER_APPS_APP_WINDOW_REGISTRY_UTIL_H_
 
 #include "ui/gfx/native_widget_types.h"
 
 namespace extensions {
 class AppWindow;
 }
 
 // Utility functions to interact with app windows across all profiles.
 class AppWindowRegistryUtil {
  public:
   // Returns the app window for |window|, looking in all browser contexts.
   static extensions::AppWindow* GetAppWindowForNativeWindowAnyProfile(
       gfx::NativeWindow window);
 
-  // Returns true if the number of app windows registered across all browser
-  // contexts is non-zero. |window_type_mask| is a bitwise OR filter of
+  // Returns true if the number of visible app windows registered across all
+  // browser contexts is non-zero. |window_type_mask| is a bitwise OR filter of
   // AppWindow::WindowType, or 0 for any window type.
-  static bool IsAppWindowRegisteredInAnyProfile(int window_type_mask);
+  static bool IsAppWindowVisibleInAnyProfile(int window_type_mask);
 
   // Close all app windows in all profiles.
   static void CloseAllAppWindows();
 };
 
 #endif  // CHROME_BROWSER_APPS_APP_WINDOW_REGISTRY_UTIL_H_