base: Add Is* functions to Value class.

chrome/browser/extensions/extension_function.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 "chrome/browser/extensions/extension_function.h"
 
 #include "base/json/json_writer.h"
 #include "base/logging.h"
 #include "chrome/browser/extensions/extension_function_dispatcher.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 68 matching lines @@
   return error_;
 }
 
 void ExtensionFunction::Run() {
   if (!RunImpl())
     SendResponse(false);
 }
 
 bool ExtensionFunction::HasOptionalArgument(size_t index) {
   Value* value;
-  return args_->Get(index, &value) && !value->IsType(Value::TYPE_NULL);
+  return args_->Get(index, &value) && !value->IsNull();
 }
 
 void ExtensionFunction::SendResponseImpl(base::ProcessHandle process,
                                          IPC::Message::Sender* ipc_sender,
                                          int routing_id,
                                          bool success) {
   DCHECK(ipc_sender);
   if (bad_message_) {
     HandleBadMessage(process);
     return;
@@ skipping 94 matching lines @@
 
 SyncIOThreadExtensionFunction::SyncIOThreadExtensionFunction() {
 }
 
 SyncIOThreadExtensionFunction::~SyncIOThreadExtensionFunction() {
 }
 
 void SyncIOThreadExtensionFunction::Run() {
   SendResponse(RunImpl());
 }