Revert of Content Shell: Introduce LayoutTestBrowserContext.

content/shell/browser/layout_test/layout_test_browser_context.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 CONTENT_SHELL_BROWSER_LAYOUT_TEST_BROWSER_CONTEXT_H_
-#define CONTENT_SHELL_BROWSER_LAYOUT_TEST_BROWSER_CONTEXT_H_
-
-#include "base/compiler_specific.h"
-#include "content/shell/browser/shell_browser_context.h"
-
-namespace net {
-class NetLog;
-}
-
-namespace content {
-
-class DownloadManagerDelegate;
-
-class LayoutTestBrowserContext : public ShellBrowserContext {
- public:
-  LayoutTestBrowserContext(bool off_the_record, net::NetLog* net_log);
-  virtual ~LayoutTestBrowserContext();
-
-  // BrowserContext implementation.
-  virtual DownloadManagerDelegate* GetDownloadManagerDelegate() override;
-
- protected:
-  // Performs initialization of the ShellBrowserContext while IO is still
-  // allowed on the current thread.
-  virtual void InitWhileIOAllowed() override;
-
-  DISALLOW_COPY_AND_ASSIGN(LayoutTestBrowserContext);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_SHELL_BROWSER_LAYOUT_TEST_BROWSER_CONTEXT_H_