Make base use the proper Value namespace

base/prefs/mock_pref_change_callback.cc

 // 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.
 
 #include "base/prefs/mock_pref_change_callback.h"
 
 #include "base/bind.h"
 
 MockPrefChangeCallback::MockPrefChangeCallback(PrefService* prefs)
     : prefs_(prefs) {
 }
 
 MockPrefChangeCallback::~MockPrefChangeCallback() {}
 
 PrefChangeRegistrar::NamedChangeCallback MockPrefChangeCallback::GetCallback() {
   return base::Bind(&MockPrefChangeCallback::OnPreferenceChanged,
                     base::Unretained(this));
 }
 
 void MockPrefChangeCallback::Expect(const std::string& pref_name,
-                                    const Value* value) {
+                                    const base::Value* value) {
   EXPECT_CALL(*this, OnPreferenceChanged(pref_name))
       .With(PrefValueMatches(prefs_, pref_name, value));
 }