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

mojo/public/cpp/bindings/tests/string_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/public/cpp/bindings/string.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
 namespace test {
 
 TEST(StringTest, DefaultIsNull) {
   String s;
   EXPECT_TRUE(s.is_null());
 }
 
 TEST(StringTest, ConstructedWithNULL) {
-  String s(NULL);
+  String s(nullptr);
   EXPECT_TRUE(s.is_null());
 }
 
 TEST(StringTest, ConstructedWithNullCharPointer) {
-  const char* null = NULL;
+  const char* null = nullptr;
   String s(null);
   EXPECT_TRUE(s.is_null());
 }
 
 TEST(StringTest, AssignedNULL) {
   String s("");
   EXPECT_FALSE(s.is_null());
-  s = NULL;
+  s = nullptr;
   EXPECT_TRUE(s.is_null());
 }
 
 TEST(StringTest, Empty) {
   String s("");
   EXPECT_FALSE(s.is_null());
   EXPECT_TRUE(s.get().empty());
 }
 
 TEST(StringTest, Basic) {
@@ skipping 15 matching lines @@
   EXPECT_EQ(s, t);
   EXPECT_TRUE(s == t);
   EXPECT_TRUE("hello world" == s);
   EXPECT_TRUE(s == "hello world");
   EXPECT_TRUE("not" != s);
   EXPECT_TRUE(s != "not");
 }
 
 }  // namespace test
 }  // namespace mojo