Make extensions developer mode adhere to policy

chrome/browser/extensions/extension_service_test_base.cc

Index: chrome/browser/extensions/extension_service_test_base.cc
diff --git a/chrome/browser/extensions/extension_service_test_base.cc b/chrome/browser/extensions/extension_service_test_base.cc
index 3179878acb208ef17e6ce569d637bc66938a43d2..182b4675a6bf5cf5cc2625c23cf2a4fcc475a82e 100644
--- a/chrome/browser/extensions/extension_service_test_base.cc
+++ b/chrome/browser/extensions/extension_service_test_base.cc
@@ -303,6 +303,11 @@ Profile* ExtensionServiceTestBase::profile() {
   return profile_.get();
 }
 
+sync_preferences::TestingPrefServiceSyncable*
+ExtensionServiceTestBase::testing_pref_service() {
+  return profile_->GetTestingPrefService();
+}
+
 void ExtensionServiceTestBase::CreateExtensionService(
     const ExtensionServiceInitParams& params) {
   TestExtensionSystem* system =