Revert of Add ExtensionsTestBrowserContext class for test.

extensions/browser/extensions_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 EXTENSIONS_COMMON_EXTENSIONS_TEST_BROWSER_CONTEXT_H_
-#define EXTENSIONS_COMMON_EXTENSIONS_TEST_BROWSER_CONTEXT_H_
-
-#include "content/public/test/test_browser_context.h"
-#include "extensions/browser/test_extensions_browser_client.h"
-
-namespace extensions {
-
-// An implementation of BrowserContext used for extension testing. It will set
-// necessary extension state like the ExtensionsBrowserClient and any keyed
-// services, and cleans up after itself on destruction.
-class ExtensionsTestBrowserContext : public content::TestBrowserContext {
- public:
-  ExtensionsTestBrowserContext();
-  virtual ~ExtensionsTestBrowserContext();
-
- private:
-  TestExtensionsBrowserClient extensions_browser_client_;
-
-  DISALLOW_COPY_AND_ASSIGN(ExtensionsTestBrowserContext);
-};
-
-}  // namespace extensions
-
-#endif  // EXTENSIONS_COMMON_EXTENSIONS_TEST_BROWSER_CONTEXT_H_