Cleanup the UseSharedProxies preference.

chrome/browser/profiles/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/profile_impl.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
@@ skipping 1052 matching lines @@
       new chromeos::EnterpriseExtensionObserver(this));
 }
 
 void ProfileImpl::InitChromeOSPreferences() {
   chromeos_preferences_.reset(new chromeos::Preferences());
   chromeos_preferences_->Init(PrefServiceSyncable::FromProfile(this));
 }
 #endif  // defined(OS_CHROMEOS)
 
 PrefProxyConfigTracker* ProfileImpl::GetProxyConfigTracker() {
-  if (!pref_proxy_config_tracker_) {
-    pref_proxy_config_tracker_.reset(
-        ProxyServiceFactory::CreatePrefProxyConfigTracker(GetPrefs()));
-  }
+  if (!pref_proxy_config_tracker_)
+    pref_proxy_config_tracker_.reset(CreateProxyConfigTracker());
   return pref_proxy_config_tracker_.get();
 }
 
 chrome_browser_net::Predictor* ProfileImpl::GetNetworkPredictor() {
   return predictor_;
 }
 
 void ProfileImpl::ClearNetworkingHistorySince(base::Time time,
                                               const base::Closure& completion) {
   io_data_.ClearNetworkingHistorySince(time, completion);
@@ skipping 68 matching lines @@
                                      base::FilePath* cache_path,
                                      int* max_size) {
   DCHECK(cache_path);
   DCHECK(max_size);
   base::FilePath path(prefs_->GetFilePath(prefs::kDiskCacheDir));
   if (!path.empty())
     *cache_path = path;
   *max_size = is_media_context ? prefs_->GetInteger(prefs::kMediaCacheSize) :
                                  prefs_->GetInteger(prefs::kDiskCacheSize);
 }
+
+PrefProxyConfigTracker* ProfileImpl::CreateProxyConfigTracker() {
+#if defined(OS_CHROMEOS)
+  if (chromeos::ProfileHelper::IsSigninProfile(this)) {
+    return ProxyServiceFactory::CreatePrefProxyConfigTrackerOfLocalState(
+        g_browser_process->local_state());
+  }
+#endif  // defined(OS_CHROMEOS)
+  return ProxyServiceFactory::CreatePrefProxyConfigTrackerOfProfile(
+      GetPrefs(), g_browser_process->local_state());
+}
+