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

mojo/system/handle_table.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/handle_table.h"
 
 #include "base/logging.h"
 #include "base/macros.h"
 #include "mojo/system/constants.h"
 #include "mojo/system/dispatcher.h"
@@ skipping 18 matching lines @@
 HandleTable::~HandleTable() {
   // This should usually not be reached (the only instance should be owned by
   // the singleton |Core|, which lives forever), except in tests.
 }
 
 Dispatcher* HandleTable::GetDispatcher(MojoHandle handle) {
   DCHECK_NE(handle, MOJO_HANDLE_INVALID);
 
   HandleToEntryMap::iterator it = handle_to_entry_map_.find(handle);
   if (it == handle_to_entry_map_.end())
-    return NULL;
+    return nullptr;
   return it->second.dispatcher.get();
 }
 
 MojoResult HandleTable::GetAndRemoveDispatcher(
     MojoHandle handle,
     scoped_refptr<Dispatcher>* dispatcher) {
   DCHECK_NE(handle, MOJO_HANDLE_INVALID);
   DCHECK(dispatcher);
 
   HandleToEntryMap::iterator it = handle_to_entry_map_.find(handle);
@@ skipping 181 matching lines @@
   for (uint32_t i = 0; i < num_handles; i++) {
     HandleToEntryMap::iterator it = handle_to_entry_map_.find(handles[i]);
     DCHECK(it != handle_to_entry_map_.end());
     DCHECK(it->second.busy);
     it->second.busy = false;
   }
 }
 
 }  // namespace system
 }  // namespace mojo