Cleanup the UseSharedProxies preference.

chrome/test/base/testing_profile.cc

Index: chrome/test/base/testing_profile.cc
diff --git a/chrome/test/base/testing_profile.cc b/chrome/test/base/testing_profile.cc
index 4536bce8f31fa30c5175fd40a82fdbb934b6332d..e35899875925ed2d5b97e524fe9524cd83d342be 100644
--- a/chrome/test/base/testing_profile.cc
+++ b/chrome/test/base/testing_profile.cc
@@ -729,8 +729,10 @@ void TestingProfile::set_last_selected_directory(const base::FilePath& path) {
 
 PrefProxyConfigTracker* TestingProfile::GetProxyConfigTracker() {
   if (!pref_proxy_config_tracker_.get()) {
+    // TestingProfile is used in unit tests, where local state is not available.
     pref_proxy_config_tracker_.reset(
-        ProxyServiceFactory::CreatePrefProxyConfigTracker(GetPrefs()));
+        ProxyServiceFactory::CreatePrefProxyConfigTrackerOfProfile(GetPrefs(),
+                                                                   NULL));
   }
   return pref_proxy_config_tracker_.get();
 }