Sanitize PrefStore interface.

chrome/common/pref_store.cc

Index: chrome/common/pref_store.cc
diff --git a/chrome/common/pref_store.cc b/chrome/common/pref_store.cc
deleted file mode 100644
index cf85417d10d900cf02666cdbd68611cd450485c3..0000000000000000000000000000000000000000
--- a/chrome/common/pref_store.cc
+++ /dev/null
@@ -1,14 +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/common/pref_store.h"
-#include "base/values.h"
-
-Value* PrefStore::CreateUseDefaultSentinelValue() {
-  return Value::CreateNullValue();
-}
-
-bool PrefStore::IsUseDefaultSentinelValue(Value* value) {
-  return value->IsType(Value::TYPE_NULL);
-}