Mojo C++ bindings: reject messages version 2 with null payload pointer.

mojo/edk/js/tests/js_to_cpp_tests.cc

Index: mojo/edk/js/tests/js_to_cpp_tests.cc
diff --git a/mojo/edk/js/tests/js_to_cpp_tests.cc b/mojo/edk/js/tests/js_to_cpp_tests.cc
index b6b74e31fbfdc692fc2b8ec00faef1d82c215471..d9fe22d22c1929f360f3f80a5cb34a73c9781be2 100644
--- a/mojo/edk/js/tests/js_to_cpp_tests.cc
+++ b/mojo/edk/js/tests/js_to_cpp_tests.cc
@@ -239,7 +239,9 @@ class CppSideConnection : public js_to_cpp::CppSide {
     mishandled_messages_ += 1;
   }
 
-  void BitFlipResponse(js_to_cpp::EchoArgsListPtr list) override {
+  void BitFlipResponse(
+      js_to_cpp::EchoArgsListPtr list,
+      js_to_cpp::ForTestingAssociatedPtrInfo not_used) override {
     mishandled_messages_ += 1;
   }
 
@@ -332,7 +334,9 @@ class BitFlipCppSideConnection : public CppSideConnection {
   // js_to_cpp::CppSide:
   void StartTest() override { js_side_->BitFlip(BuildSampleEchoArgs()); }
 
-  void BitFlipResponse(js_to_cpp::EchoArgsListPtr list) override {
+  void BitFlipResponse(
+      js_to_cpp::EchoArgsListPtr list,
+      js_to_cpp::ForTestingAssociatedPtrInfo not_used) override {
     CheckCorruptedEchoArgsList(list);
   }