Clean up pref change notification handling.

chrome/browser/prefs/dummy_pref_store.cc

Index: chrome/browser/prefs/dummy_pref_store.cc
diff --git a/chrome/browser/prefs/dummy_pref_store.cc b/chrome/browser/prefs/dummy_pref_store.cc
deleted file mode 100644
index 3a0a81a8849d6f8b38613bdedacafc4d0f6b925a..0000000000000000000000000000000000000000
--- a/chrome/browser/prefs/dummy_pref_store.cc
+++ /dev/null
@@ -1,22 +0,0 @@
-// 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.
-
-#include "chrome/browser/prefs/dummy_pref_store.h"
-
-#include "base/values.h"
-
-DummyPrefStore::DummyPrefStore()
-    : prefs_(new DictionaryValue()),
-      read_only_(true),
-      prefs_written_(false) { }
-
-PrefStore::PrefReadError DummyPrefStore::ReadPrefs() {
-  prefs_.reset(new DictionaryValue());
-  return PrefStore::PREF_READ_ERROR_NONE;
-}
-
-bool DummyPrefStore::WritePrefs() {
-  prefs_written_ = true;
-  return prefs_written_;
-}