Implement support for importing favorites from Edge on Windows 10.

chrome/common/importer/ie_importer_test_registry_overrider_win.h

-// Copyright (c) 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.
-
-#ifndef CHROME_COMMON_IMPORTER_IE_IMPORTER_TEST_REGISTRY_OVERRIDER_WIN_H_
-#define CHROME_COMMON_IMPORTER_IE_IMPORTER_TEST_REGISTRY_OVERRIDER_WIN_H_
-
-#include "base/basictypes.h"
-#include "base/strings/string16.h"
-
-// A helper class to let tests generate a random registry key to be used in
-// HKEY_CURRENT_USER in tests. After the key has been generated by constructing
-// an IEImporterTestRegistryOverrider, consumers in this process (or in any
-// child processes created after the key has been generated) can obtain the key
-// via GetTestRegistryOverride(). IEImporterTestRegistryOverrider will delete
-// the temporary key upon being deleted itself. Only one
-// IEImporterTestRegistryOverrider should live at once in a given process
-// hiearchy.
-class IEImporterTestRegistryOverrider {
- public:
-  IEImporterTestRegistryOverrider();
-  ~IEImporterTestRegistryOverrider();
-
-  // Returns a test key if one was chosen and set by a call to
-  // SetTestRegistryOverride(); returns the empty string if none.
-  static base::string16 GetTestRegistryOverride();
-
- private:
-  base::string16 temporary_key_;
-
-  DISALLOW_COPY_AND_ASSIGN(IEImporterTestRegistryOverrider);
-};
-
-#endif  // CHROME_COMMON_IMPORTER_IE_IMPORTER_TEST_REGISTRY_OVERRIDER_WIN_H_