api-prototype-6.2.0 fails to build

[gabrielschulhof]

As of ae24137 I get

../src/node_jsvmapi.cc: In constructor ‘v8impl::CallbackWrapperBase<T, I>::CallbackWrapperBase(const T&)’:
../src/node_jsvmapi.cc:204:46: error: expected primary-expression before ‘>’ token
           _cbdata(cbinfo.Data().As<v8::Object>()) {
                                              ^
../src/node_jsvmapi.cc:204:48: error: expected primary-expression before ‘)’ token
           _cbdata(cbinfo.Data().As<v8::Object>()) {

when trying to build the branch.