Revert of Move base/prefs to components/prefs

components/prefs/pref_store_observer_mock.h

Index: components/prefs/pref_store_observer_mock.h
diff --git a/components/prefs/pref_store_observer_mock.h b/components/prefs/pref_store_observer_mock.h
deleted file mode 100644
index 1b24b4e068f1be84dd3fd6e081a0c5517d97bec7..0000000000000000000000000000000000000000
--- a/components/prefs/pref_store_observer_mock.h
+++ /dev/null
@@ -1,35 +0,0 @@
-// Copyright (c) 2011 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 BASE_PREFS_PREF_STORE_OBSERVER_MOCK_H_
-#define BASE_PREFS_PREF_STORE_OBSERVER_MOCK_H_
-
-#include <string>
-#include <vector>
-
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "base/prefs/pref_store.h"
-
-// A mock implementation of PrefStore::Observer.
-class PrefStoreObserverMock : public PrefStore::Observer {
- public:
-  PrefStoreObserverMock();
-  ~PrefStoreObserverMock() override;
-
-  void VerifyAndResetChangedKey(const std::string& expected);
-
-  // PrefStore::Observer implementation
-  void OnPrefValueChanged(const std::string& key) override;
-  void OnInitializationCompleted(bool success) override;
-
-  std::vector<std::string> changed_keys;
-  bool initialized;
-  bool initialization_success;  // Only valid if |initialized|.
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(PrefStoreObserverMock);
-};
-
-#endif  // BASE_PREFS_PREF_STORE_OBSERVER_MOCK_H_