Convert implicit scoped_refptr constructor calls to explicit ones, part 1

chrome/browser/sync/glue/history_model_worker.cc

Index: chrome/browser/sync/glue/history_model_worker.cc
diff --git a/chrome/browser/sync/glue/history_model_worker.cc b/chrome/browser/sync/glue/history_model_worker.cc
index b6f3e5e6515d9f9ac399a6a5ca37bd526c6a6926..1c39501faecc7dddd69e267b6586d6372d44820a 100644
--- a/chrome/browser/sync/glue/history_model_worker.cc
+++ b/chrome/browser/sync/glue/history_model_worker.cc
@@ -46,7 +46,7 @@ HistoryModelWorker::~HistoryModelWorker() {
 
 void HistoryModelWorker::DoWorkAndWaitUntilDone(Callback0::Type* work) {
   WaitableEvent done(false, false);
-  scoped_refptr<WorkerTask> task = new WorkerTask(work, &done);
+  scoped_refptr<WorkerTask> task(new WorkerTask(work, &done));
   history_service_->ScheduleDBTask(task.get(), this);
   done.Wait();
 }