Call scoped_refptr<T>::get() rather than relying on implicit "operator T*"

chrome/browser/prefs/chrome_pref_service_unittest.cc

Index: chrome/browser/prefs/chrome_pref_service_unittest.cc
diff --git a/chrome/browser/prefs/chrome_pref_service_unittest.cc b/chrome/browser/prefs/chrome_pref_service_unittest.cc
index 3afa38d2e044160cd8741258083a6bff9616d1a7..226c6cf6dda7050f4acb1c85619fab951a29b8d0 100644
--- a/chrome/browser/prefs/chrome_pref_service_unittest.cc
+++ b/chrome/browser/prefs/chrome_pref_service_unittest.cc
@@ -98,7 +98,8 @@ TEST_F(ChromePrefServiceUserFilePrefsTest, PreserveEmptyValue) {
       pref_file));
 
   PrefServiceMockBuilder builder;
-  builder.WithUserFilePrefs(pref_file, message_loop_.message_loop_proxy());
+  builder.WithUserFilePrefs(pref_file,
+                            message_loop_.message_loop_proxy().get());
   scoped_refptr<user_prefs::PrefRegistrySyncable> registry(
       new user_prefs::PrefRegistrySyncable);
   scoped_ptr<PrefServiceSyncable> prefs(builder.CreateSyncable(registry.get()));