ChromeOS: Remove ProfileHelper::IsSigninProfile.

chrome/browser/profiles/off_the_record_profile_impl.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 "chrome/browser/profiles/off_the_record_profile_impl.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
@@ skipping 465 matching lines @@
     case HostZoomMap::ZOOM_CHANGED_FOR_SCHEME_AND_HOST:
        host_zoom_map->SetZoomLevelForHostAndScheme(change.scheme,
            change.host,
            change.zoom_level);
        return;
   }
 }
 
 PrefProxyConfigTracker* OffTheRecordProfileImpl::CreateProxyConfigTracker() {
 #if defined(OS_CHROMEOS)
-  if (chromeos::ProfileHelper::IsSigninProfile(this)) {
+  if (IsLoginProfile()) {
     return ProxyServiceFactory::CreatePrefProxyConfigTrackerOfLocalState(
         g_browser_process->local_state());
   }
 #endif  // defined(OS_CHROMEOS)
   return ProxyServiceFactory::CreatePrefProxyConfigTrackerOfProfile(
       GetPrefs(), g_browser_process->local_state());
 }