Remove the last usages of PrefObserver outside of Prefs.

chrome/browser/prefs/pref_observer_mock.h

-// 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 CHROME_BROWSER_PREFS_PREF_OBSERVER_MOCK_H_
-#define CHROME_BROWSER_PREFS_PREF_OBSERVER_MOCK_H_
-
-#include <string>
-
-#include "base/prefs/public/pref_observer.h"
-#include "chrome/browser/prefs/pref_service.h"
-#include "testing/gmock/include/gmock/gmock.h"
-
-using testing::Pointee;
-using testing::Property;
-using testing::Truly;
-
-// Matcher that checks whether the current value of the preference named
-// |pref_name| in |prefs| matches |value|. If |value| is NULL, the matcher
-// checks that the value is not set.
-MATCHER_P3(PrefValueMatches, prefs, pref_name, value, "") {
-  const PrefServiceBase::Preference* pref =
-      prefs->FindPreference(pref_name.c_str());
-  if (!pref)
-    return false;
-
-  const Value* actual_value = pref->GetValue();
-  if (!actual_value)
-    return value == NULL;
-  if (!value)
-    return actual_value == NULL;
-  return value->Equals(actual_value);
-}
-
-// A mock for testing preference notifications and easy setup of expectations.
-class PrefObserverMock : public PrefObserver {
- public:
-  PrefObserverMock();
-  virtual ~PrefObserverMock();
-
-  MOCK_METHOD2(OnPreferenceChanged, void(PrefServiceBase*, const std::string&));
-
-  void Expect(PrefServiceBase* prefs,
-              const std::string& pref_name,
-              const Value* value);
-};
-
-#endif  // CHROME_BROWSER_PREFS_PREF_OBSERVER_MOCK_H_