Clean up most of the ChromeOS headers in non-ChromeOS build

chrome/browser/extensions/api/settings_private/settings_private_event_router.h

 // Copyright 2015 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_SETTINGS_PRIVATE_SETTINGS_PRIVATE_EVENT_ROUTER_H_
 #define CHROME_BROWSER_EXTENSIONS_API_SETTINGS_PRIVATE_SETTINGS_PRIVATE_EVENT_ROUTER_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
-#include "chrome/browser/chromeos/settings/cros_settings.h"
 #include "chrome/browser/extensions/api/settings_private/prefs_util.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "components/prefs/pref_change_registrar.h"
 #include "extensions/browser/event_router.h"
 
+// TODO(wychen): ChromeOS headers should only be included when building
+//               ChromeOS, and the following headers should be guarded by
+//               #if defined(OS_CHROMEOS). However, the types are actually
+//               used, and it takes another CL to clean them up.
+//               Reference: crbug.com/720159
+#include "chrome/browser/chromeos/settings/cros_settings.h"
+
 namespace content {
 class BrowserContext;
 }
 
 namespace extensions {
 
 // This is an event router that will observe listeners to pref changes on the
 // appropriate pref service(s) and notify listeners on the JavaScript
 // settingsPrivate API.
 class SettingsPrivateEventRouter : public KeyedService,
@@ skipping 44 matching lines @@
   std::unique_ptr<PrefsUtil> prefs_util_;
 
   base::WeakPtrFactory<SettingsPrivateEventRouter> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SettingsPrivateEventRouter);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_SETTINGS_PRIVATE_SETTINGS_PRIVATE_EVENT_ROUTER_H_