Explicitly initialize secondary renderers for layout tests.

content/shell/browser/layout_test/notify_done_forwarder.cc

-// Copyright 2013 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 "content/shell/browser/layout_test/notify_done_forwarder.h"
-
-#include "content/shell/browser/layout_test/blink_test_controller.h"
-#include "content/shell/common/shell_messages.h"
-
-namespace content {
-
-DEFINE_WEB_CONTENTS_USER_DATA_KEY(NotifyDoneForwarder);
-
-NotifyDoneForwarder::NotifyDoneForwarder(WebContents* web_contents)
-    : WebContentsObserver(web_contents) {}
-
-NotifyDoneForwarder::~NotifyDoneForwarder() {}
-
-bool NotifyDoneForwarder::OnMessageReceived(const IPC::Message& message) {
-  bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP(NotifyDoneForwarder, message)
-    IPC_MESSAGE_HANDLER(ShellViewHostMsg_TestFinishedInSecondaryRenderer,
-                        OnTestFinishedInSecondaryRenderer)
-    IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP()
-  return handled;
-}
-
-void NotifyDoneForwarder::OnTestFinishedInSecondaryRenderer() {
-  BlinkTestController::Get()->TestFinishedInSecondaryRenderer();
-}
-
-}  // namespace content