replace NULL->nullptr in src/remoting.

remoting/host/native_messaging/native_messaging_writer_unittest.cc

 // Copyright 2013 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 "remoting/host/native_messaging/native_messaging_writer.h"
 
 #include "base/basictypes.h"
 #include "base/json/json_reader.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/stl_util.h"
@@ skipping 37 matching lines @@
   std::string content(length, '\0');
   read = read_file_.ReadAtCurrentPos(string_as_array(&content), length);
   EXPECT_EQ(static_cast<int>(length), read);
 
   // |content| should now contain serialized |message|.
   scoped_ptr<base::Value> written_message(base::JSONReader::Read(content));
   EXPECT_TRUE(message.Equals(written_message.get()));
 
   // Nothing more should have been written. Close the write-end of the pipe,
   // and verify the read end immediately hits EOF.
-  writer_.reset(NULL);
+  writer_.reset(nullptr);
   char unused;
   read = read_file_.ReadAtCurrentPos(&unused, 1);
   EXPECT_LE(read, 0);
 }
 
 TEST_F(NativeMessagingWriterTest, SecondMessage) {
   base::DictionaryValue message1;
   base::DictionaryValue message2;
   message2.SetInteger("foo", 42);
   EXPECT_TRUE(writer_->WriteMessage(message1));
   EXPECT_TRUE(writer_->WriteMessage(message2));
-  writer_.reset(NULL);
+  writer_.reset(nullptr);
 
   // Read two messages.
   uint32 length;
   int read;
   std::string content;
   for (int i = 0; i < 2; i++) {
     read = read_file_.ReadAtCurrentPos(reinterpret_cast<char*>(&length), 4);
     EXPECT_EQ(4, read) << "i = " << i;
     content.resize(length);
     read = read_file_.ReadAtCurrentPos(string_as_array(&content), length);
     EXPECT_EQ(static_cast<int>(length), read) << "i = " << i;
   }
 
   // |content| should now contain serialized |message2|.
   scoped_ptr<base::Value> written_message2(base::JSONReader::Read(content));
   EXPECT_TRUE(message2.Equals(written_message2.get()));
 }
 
 TEST_F(NativeMessagingWriterTest, FailedWrite) {
   // Close the read end so that writing fails immediately.
   read_file_.Close();
 
   base::DictionaryValue message;
   EXPECT_FALSE(writer_->WriteMessage(message));
 }
 
 }  // namespace remoting