Mojo: NULL -> nullptr in mojo/public/cpp/bindings and also for the bindings generator.

mojo/public/cpp/bindings/lib/fixed_buffer.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/public/cpp/bindings/lib/fixed_buffer.h"
 
 #include <stdlib.h>
 
 #include <algorithm>
 
 #include "mojo/public/cpp/bindings/lib/bindings_serialization.h"
 #include "mojo/public/cpp/environment/logging.h"
 
 namespace mojo {
 namespace internal {
 
 FixedBuffer::FixedBuffer(size_t size)
-    : ptr_(NULL),
+    : ptr_(nullptr),
       cursor_(0),
       size_(internal::Align(size)) {
   // calloc() required to zero memory and thus avoid info leaks.
   ptr_ = static_cast<char*>(calloc(size_, 1));
 }
 
 FixedBuffer::~FixedBuffer() {
   free(ptr_);
 }
 
 void* FixedBuffer::Allocate(size_t delta) {
   delta = internal::Align(delta);
 
   if (delta == 0 || delta > size_ - cursor_) {
     MOJO_DCHECK(false) << "Not reached";
-    return NULL;
+    return nullptr;
   }
 
   char* result = ptr_ + cursor_;
   cursor_ += delta;
 
   return result;
 }
 
 void* FixedBuffer::Leak() {
   char* ptr = ptr_;
-  ptr_ = NULL;
+  ptr_ = nullptr;
   cursor_ = 0;
   size_ = 0;
   return ptr;
 }
 
 }  // namespace internal
 }  // namespace mojo