Remove content::NotificationObserver dependency from most Prefs code.

chrome/browser/prefs/scoped_user_pref_update_unittest.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/public/pref_change_registrar.h"
 #include "chrome/browser/prefs/pref_observer_mock.h"
 #include "chrome/browser/prefs/scoped_user_pref_update.h"
 #include "chrome/test/base/testing_pref_service.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 24 matching lines @@
 const char ScopedUserPrefUpdateTest::kPref[] = "name";
 const char ScopedUserPrefUpdateTest::kKey[] = "key";
 const char ScopedUserPrefUpdateTest::kValue[] = "value";
 
 TEST_F(ScopedUserPrefUpdateTest, RegularUse) {
   // Dictionary that will be expected to be set at the end.
   DictionaryValue expected_dictionary;
   expected_dictionary.SetString(kKey, kValue);
 
   {
-    EXPECT_CALL(observer_, Observe(_, _, _)).Times(0);
+    EXPECT_CALL(observer_, OnPreferenceChanged(_, _)).Times(0);
     DictionaryPrefUpdate update(&prefs_, kPref);
     DictionaryValue* value = update.Get();
     ASSERT_TRUE(value);
     value->SetString(kKey, kValue);
 
     // The dictionary was created for us but the creation should have happened
     // silently without notifications.
     Mock::VerifyAndClearExpectations(&observer_);
 
     // Modifications happen online and are instantly visible, though.
     const DictionaryValue* current_value = prefs_.GetDictionary(kPref);
     ASSERT_TRUE(current_value);
     EXPECT_TRUE(expected_dictionary.Equals(current_value));
 
     // Now we are leaving the scope of the update so we should be notified.
     observer_.Expect(&prefs_, kPref, &expected_dictionary);
   }
   Mock::VerifyAndClearExpectations(&observer_);
 
   const DictionaryValue* current_value = prefs_.GetDictionary(kPref);
   ASSERT_TRUE(current_value);
   EXPECT_TRUE(expected_dictionary.Equals(current_value));
 }
 
 TEST_F(ScopedUserPrefUpdateTest, NeverTouchAnything) {
   const DictionaryValue* old_value = prefs_.GetDictionary(kPref);
-  EXPECT_CALL(observer_, Observe(_, _, _)).Times(0);
+  EXPECT_CALL(observer_, OnPreferenceChanged(_, _)).Times(0);
   {
     DictionaryPrefUpdate update(&prefs_, kPref);
   }
   const DictionaryValue* new_value = prefs_.GetDictionary(kPref);
   EXPECT_EQ(old_value, new_value);
   Mock::VerifyAndClearExpectations(&observer_);
 }