Cleanup the UseSharedProxies preference.

chrome/browser/chromeos/ui_proxy_config_service.cc

Index: chrome/browser/chromeos/ui_proxy_config_service.cc
diff --git a/chrome/browser/chromeos/ui_proxy_config_service.cc b/chrome/browser/chromeos/ui_proxy_config_service.cc
index 0f6988a65c2a2c769d7d302e78c8ee4267007526..80c0f22af80fbba3de87257f8dc2362746f8aeed 100644
--- a/chrome/browser/chromeos/ui_proxy_config_service.cc
+++ b/chrome/browser/chromeos/ui_proxy_config_service.cc
@@ -62,7 +62,9 @@ UIProxyConfigService::UIProxyConfigService() {
 UIProxyConfigService::~UIProxyConfigService() {
 }
 
-void UIProxyConfigService::SetPrefs(PrefService* pref_service) {
+void UIProxyConfigService::SetPrefs(bool login_profile,
+                                    PrefService* pref_service) {
+  login_profile_ = login_profile;
   pref_service_ = pref_service;
 }
 
@@ -157,10 +159,10 @@ void UIProxyConfigService::DetermineEffectiveConfig(
     current_ui_config_.state = ProxyPrefs::CONFIG_POLICY;
     current_ui_config_.user_modifiable = false;
   } else {
-    current_ui_config_.user_modifiable =
-        !ProxyConfigServiceImpl::IgnoreProxy(pref_service_,
-                                             network.profile_path(),
-                                             network.onc_source());
+    current_ui_config_.user_modifiable = !ProxyConfigServiceImpl::IgnoreProxy(
+        login_profile_ ? NULL : pref_service_,
+        network.profile_path(),
+        network.onc_source());
   }
 }