[Plasma] Plasma fails building with CUDA enabled

../src/plasma/store.cc: In member function 'uint8_t* plasma::PlasmaStore::AllocateMemory(int, size_t, int*, int64_t*, ptrdiff_t*)':
../src/plasma/store.cc:187:36: error: 'data_size' was not declared in this scope
       DCHECK_OK(context_->Allocate(data_size + metadata_size, &gpu_handle));
                                    ^

../src/plasma/store.cc: In member function 'plasma::flatbuf::PlasmaError plasma::PlasmaStore::CreateObject(const ObjectID&, int64_t, int64_t, int, plasma::Client*, plasma::PlasmaObject*)':
../src/plasma/store.cc:236:15: error: 'gpu_handle' was not declared in this scope
     DCHECK_OK(gpu_handle->ExportForIpc(&entry->ipc_handle));
               ^