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

mojo/public/cpp/bindings/tests/buffer_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 <limits>
 
 #include "mojo/public/cpp/bindings/lib/bindings_serialization.h"
 #include "mojo/public/cpp/bindings/lib/fixed_buffer.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 23 matching lines @@
   void* b = buf.Allocate(10);
   ASSERT_TRUE(b);
   EXPECT_TRUE(IsZero(b, 10));
   EXPECT_EQ(0, reinterpret_cast<ptrdiff_t>(b) % 8);
 
   // Any more allocations would result in an assert, but we can't test that.
 }
 
 // Tests that FixedBuffer::Leak passes ownership to the caller.
 TEST(FixedBufferTest, Leak) {
-  void* ptr = NULL;
-  void* buf_ptr = NULL;
+  void* ptr = nullptr;
+  void* buf_ptr = nullptr;
   {
     internal::FixedBuffer buf(8);
     ASSERT_EQ(8u, buf.size());
 
     ptr = buf.Allocate(8);
     ASSERT_TRUE(ptr);
     buf_ptr = buf.Leak();
 
     // The buffer should point to the first element allocated.
     // TODO(mpcomplete): Is this a reasonable expectation?
@@ skipping 26 matching lines @@
 
   // A lot too large, leading to possible integer overflow.
   EXPECT_EQ(reinterpret_cast<void*>(0),
             buf.Allocate(std::numeric_limits<size_t>::max() - 8u));
 }
 #endif
 
 }  // namespace
 }  // namespace test
 }  // namespace mojo