More base::Values-related bare pointer -> scoped_ptr conversions

cc/debug/invalidation_benchmark.cc

Index: cc/debug/invalidation_benchmark.cc
diff --git a/cc/debug/invalidation_benchmark.cc b/cc/debug/invalidation_benchmark.cc
index bb98bcc74399afcec2a80f074a9d6c03a7fc5dc5..6fd3d3e2fb672be46b33b9b29a7381977400046b 100644
--- a/cc/debug/invalidation_benchmark.cc
+++ b/cc/debug/invalidation_benchmark.cc
@@ -116,7 +116,7 @@ bool InvalidationBenchmark::ProcessMessage(scoped_ptr<base::Value> value) {
   if (message->HasKey("notify_done")) {
     message->GetBoolean("notify_done", &notify_done);
     if (notify_done)
-      NotifyDone(scoped_ptr<base::Value>(base::Value::CreateNullValue()));
+      NotifyDone(base::Value::CreateNullValue());
     return true;
   }
   return false;