Remove the old task manager view

chrome/browser/task_manager/printing_information.h

 // 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_PRINTING_INFORMATION_H_
 #define CHROME_BROWSER_TASK_MANAGER_PRINTING_INFORMATION_H_
 
 #include "base/macros.h"
 #include "chrome/browser/task_manager/web_contents_information.h"
 
 namespace task_manager {
 
-#if defined(ENABLE_PRINT_PREVIEW)
 class PrintingResource;
 
 // WebContentsInformation for WebContentses that are created for print preview
 // and background printing.
 class PrintingInformation : public NotificationObservingWebContentsInformation {
  public:
   PrintingInformation();
   ~PrintingInformation() override;
 
   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(PrintingInformation);
 };
-#endif  // defined(ENABLE_PRINT_PREVIEW)
 
 }  // namespace task_manager
 
 #endif  // CHROME_BROWSER_TASK_MANAGER_PRINTING_INFORMATION_H_