Mojo: NULL -> nullptr in mojo/system and mojo/embedder.

mojo/system/platform_handle_dispatcher_unittest.cc

 // Copyright 2014 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 "mojo/system/platform_handle_dispatcher.h"
 
 #include <stdio.h>
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
@@ skipping 70 matching lines @@
   EXPECT_TRUE(transport.is_valid());
   EXPECT_EQ(Dispatcher::kTypePlatformHandle, transport.GetType());
   EXPECT_FALSE(transport.IsBusy());
 
   scoped_refptr<Dispatcher> generic_dispatcher =
       transport.CreateEquivalentDispatcherAndClose();
   ASSERT_TRUE(generic_dispatcher.get());
 
   transport.End();
   EXPECT_TRUE(dispatcher->HasOneRef());
-  dispatcher = NULL;
+  dispatcher = nullptr;
 
   ASSERT_EQ(Dispatcher::kTypePlatformHandle, generic_dispatcher->GetType());
   dispatcher = static_cast<PlatformHandleDispatcher*>(generic_dispatcher.get());
 
   fp = mojo::test::FILEFromPlatformHandle(dispatcher->PassPlatformHandle(),
                                           "rb").Pass();
   EXPECT_TRUE(fp);
 
   rewind(fp.get());
   char read_buffer[1000] = {};
   EXPECT_EQ(sizeof(kFooBar),
             fread(read_buffer, 1, sizeof(read_buffer), fp.get()));
   EXPECT_STREQ(kFooBar, read_buffer);
 
   EXPECT_EQ(MOJO_RESULT_OK, dispatcher->Close());
 }
 
 }  // namespace
 }  // namespace system
 }  // namespace mojo