Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

chrome/browser/prefs/proxy_policy_unittest.cc

Index: chrome/browser/prefs/proxy_policy_unittest.cc
diff --git a/chrome/browser/prefs/proxy_policy_unittest.cc b/chrome/browser/prefs/proxy_policy_unittest.cc
index a2f3e1cda6f0672568b02c3e325fbb8b2ca7b39f..823c204a7b17f0e5071e36b8af37bf79adf16689 100644
--- a/chrome/browser/prefs/proxy_policy_unittest.cc
+++ b/chrome/browser/prefs/proxy_policy_unittest.cc
@@ -97,7 +97,7 @@ class ProxyPolicyTest : public testing::Test {
     builder.WithCommandLine(&command_line_);
     if (with_managed_policies)
       builder.WithManagedPolicies(policy_service_.get());
-    PrefService* prefs = builder.Create();
+    PrefServiceSyncable* prefs = builder.CreateSyncable();
     chrome::RegisterUserPrefs(prefs);
     return prefs;
   }