Introduce AppsClient and use it in apps to get the loaded profiles list.

chrome/browser/extensions/api/media_galleries/media_galleries_api.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.
 
 // Implements the Chrome Extensions Media Galleries API.
 
 #include "chrome/browser/extensions/api/media_galleries/media_galleries_api.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "apps/shell_window.h"
 #include "apps/shell_window_registry.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/platform_file.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/media_galleries/media_file_system_registry.h"
 #include "chrome/browser/media_galleries/media_galleries_dialog_controller.h"
+#include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/storage_monitor/storage_monitor.h"
 #include "chrome/browser/ui/chrome_select_file_policy.h"
 #include "chrome/common/extensions/api/media_galleries.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/permissions/api_permission.h"
 #include "chrome/common/extensions/permissions/media_galleries_permission.h"
 #include "chrome/common/extensions/permissions/permissions_data.h"
 #include "chrome/common/pref_names.h"
 #include "components/web_modal/web_contents_modal_dialog_manager.h"
 #include "content/public/browser/child_process_security_policy.h"
@@ skipping 203 matching lines @@
   }
 
   DCHECK(StorageMonitor::GetInstance()->IsInitialized());
   MediaFileSystemRegistry* registry =
       g_browser_process->media_file_system_registry();
   registry->GetMediaFileSystemsForExtension(
       render_view_host(), GetExtension(), cb);
 }
 
 }  // namespace extensions