Wait for URLBlacklist update tasks on automation tests.

chrome/test/base/signaling_task.cc

Index: chrome/test/base/signaling_task.cc
diff --git a/chrome/test/base/signaling_task.cc b/chrome/test/base/signaling_task.cc
deleted file mode 100644
index b4fa6803a1c1fc55967496b1ff69da56dcfec204..0000000000000000000000000000000000000000
--- a/chrome/test/base/signaling_task.cc
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "chrome/test/base/signaling_task.h"
-
-#include "base/synchronization/waitable_event.h"
-
-SignalingTask::SignalingTask(base::WaitableEvent* event) : event_(event) {
-}
-
-SignalingTask::~SignalingTask() {}
-
-void SignalingTask::Run() {
-  event_->Signal();
-}