Move the Mac Task Manager to the new backend code.

chrome/browser/task_manager/tab_contents_information.h

Index: chrome/browser/task_manager/tab_contents_information.h
diff --git a/chrome/browser/task_manager/tab_contents_information.h b/chrome/browser/task_manager/tab_contents_information.h
deleted file mode 100644
index c616a4e656e0638265857c700fc9abab2744cf83..0000000000000000000000000000000000000000
--- a/chrome/browser/task_manager/tab_contents_information.h
+++ /dev/null
@@ -1,35 +0,0 @@
-// Copyright 2014 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.
-
-#ifndef CHROME_BROWSER_TASK_MANAGER_TAB_CONTENTS_INFORMATION_H_
-#define CHROME_BROWSER_TASK_MANAGER_TAB_CONTENTS_INFORMATION_H_
-
-#include "base/macros.h"
-#include "chrome/browser/task_manager/web_contents_information.h"
-
-namespace task_manager {
-
-// WebContentsInformation for WebContentses that are part of the tab strip
-// model, devtools, and/or the PrerenderManager. These three cases are combined
-// into one category because, for example, a prerendered WebContents can become
-// part of the tab strip model over its lifetime.
-class TabContentsInformation
-    : public NotificationObservingWebContentsInformation {
- public:
-  TabContentsInformation();
-  ~TabContentsInformation() override;
-
-  // WebContentsInformation implementation.
-  bool CheckOwnership(content::WebContents* web_contents) override;
-  void GetAll(const NewWebContentsCallback& callback) override;
-  std::unique_ptr<RendererResource> MakeResource(
-      content::WebContents* web_contents) override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(TabContentsInformation);
-};
-
-}  // namespace task_manager
-
-#endif  // CHROME_BROWSER_TASK_MANAGER_TAB_CONTENTS_INFORMATION_H_