Moves HistoryIndexRestoreObserver to components/omnibox/browser.

chrome/test/base/history_index_restore_observer.h

-// Copyright (c) 2012 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_TEST_BASE_HISTORY_INDEX_RESTORE_OBSERVER_H_
-#define CHROME_TEST_BASE_HISTORY_INDEX_RESTORE_OBSERVER_H_
-
-#include "base/callback.h"
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "components/omnibox/browser/in_memory_url_index.h"
-
-// HistoryIndexRestoreObserver is used when blocking until the InMemoryURLIndex
-// finishes restoring. As soon as the InMemoryURLIndex finishes restoring the
-// provided Closure is invoked.
-class HistoryIndexRestoreObserver
-    : public InMemoryURLIndex::RestoreCacheObserver {
- public:
-  explicit HistoryIndexRestoreObserver(const base::Closure& task);
-  ~HistoryIndexRestoreObserver() override;
-
-  bool succeeded() const { return succeeded_; }
-
-  // RestoreCacheObserver implementation.
-  void OnCacheRestoreFinished(bool success) override;
-
- private:
-  base::Closure task_;
-  bool succeeded_;
-
-  DISALLOW_COPY_AND_ASSIGN(HistoryIndexRestoreObserver);
-};
-
-#endif  // CHROME_TEST_BASE_HISTORY_INDEX_RESTORE_OBSERVER_H_