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

mojo/public/cpp/bindings/tests/buffer_unittest.cc

Index: mojo/public/cpp/bindings/tests/buffer_unittest.cc
diff --git a/mojo/public/cpp/bindings/tests/buffer_unittest.cc b/mojo/public/cpp/bindings/tests/buffer_unittest.cc
index f881784ab77c168960e799e79bcecfed2009a3b6..61424c056233bc7ae8c4ff88197e51a5abddc8a2 100644
--- a/mojo/public/cpp/bindings/tests/buffer_unittest.cc
+++ b/mojo/public/cpp/bindings/tests/buffer_unittest.cc
@@ -41,8 +41,8 @@ TEST(FixedBufferTest, Alignment) {
 
 // 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());