base: Add three helper functions to Values API.

content/renderer/web_ui_bindings.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 "content/renderer/web_ui_bindings.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/stl_util.h"
 #include "base/values.h"
 #include "content/common/view_messages.h"
@@ skipping 20 matching lines @@
     // We currently assume all objects are arrays.
     std::vector<CppVariant> vector = value.ToVector();
     ListValue* list = new ListValue();
     for (size_t i = 0; i < vector.size(); ++i) {
       list->Append(CreateValueFromCppVariant(vector[i]));
     }
     return list;
   }
 
   // Covers null and undefined.
-  return Value::CreateNullValue();
+  return base::NullValue();
 }
 
 }  // namespace
 
 DOMBoundBrowserObject::DOMBoundBrowserObject()
     : sender_(NULL),
       routing_id_(0) {
 }
 
 DOMBoundBrowserObject::~DOMBoundBrowserObject() {
@@ skipping 44 matching lines @@
       *(static_cast<ListValue*>(content.get()))));
 }
 
 void DOMBoundBrowserObject::SetProperty(const std::string& name,
                                 const std::string& value) {
   CppVariant* cpp_value = new CppVariant;
   cpp_value->Set(value);
   BindProperty(name, cpp_value);
   properties_.push_back(cpp_value);
 }