Clean up pref change notification handling.

chrome/common/pref_store_observer_mock.h

Index: chrome/common/pref_store_observer_mock.h
diff --git a/chrome/common/pref_store_observer_mock.h b/chrome/common/pref_store_observer_mock.h
new file mode 100644
index 0000000000000000000000000000000000000000..72e27a13e7126195786aff8cb09aa5ddde4e2595
--- /dev/null
+++ b/chrome/common/pref_store_observer_mock.h
@@ -0,0 +1,26 @@
+// Copyright (c) 2010 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_PREF_STORE_OBSERVER_MOCK_H_
+#define CHROME_COMMON_PREF_STORE_OBSERVER_MOCK_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "chrome/common/pref_store.h"
+#include "testing/gmock/include/gmock/gmock.h"
+
+// A gmock-ified implementation of PrefStore::ObserverInterface.
+class PrefStoreObserverMock : public PrefStore::ObserverInterface {
+ public:
+  PrefStoreObserverMock() {}
+  virtual ~PrefStoreObserverMock() {}
+
+  MOCK_METHOD1(OnPrefValueChanged, void(const std::string&));
+  MOCK_METHOD0(OnInitializationCompleted, void());
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PrefStoreObserverMock);
+};
+
+#endif  // CHROME_COMMON_PREF_STORE_OBSERVER_MOCK_H_