Make element removal methods in DictionaryValue and ListValue take scoped_ptr's as outparams.

cloud_print/service/win/chrome_launcher.cc

Index: cloud_print/service/win/chrome_launcher.cc
diff --git a/cloud_print/service/win/chrome_launcher.cc b/cloud_print/service/win/chrome_launcher.cc
index 1d7b26d6bd068ec869c9df5412bc564b31f2b5ed..6e3366ab6f8f80ccc38d4f38315f91d93393ef2a 100644
--- a/cloud_print/service/win/chrome_launcher.cc
+++ b/cloud_print/service/win/chrome_launcher.cc
@@ -139,10 +139,10 @@ std::string ReadAndUpdateServiceState(const base::FilePath& directory,
   }
 
   // Remove everything except kCloudPrintRoot.
-  base::Value* cloud_print_root = NULL;
+  scoped_ptr<base::Value> cloud_print_root;
   dictionary->Remove(prefs::kCloudPrintRoot, &cloud_print_root);
   dictionary->Clear();
-  dictionary->Set(prefs::kCloudPrintRoot, cloud_print_root);
+  dictionary->Set(prefs::kCloudPrintRoot, cloud_print_root.release());
 
   dictionary->SetBoolean(prefs::kCloudPrintXmppPingEnabled, true);
   if (!proxy_id.empty())  // Reuse proxy id if we already had one.