message: Fix a failure in remote_mgr_test and c_api_test.
diff: @@ -27,6 +27,21 @@ namespace {
  void DestroyRemoteTensorHandle(EagerContext* ctx, const string& remote_task,
  uint64 context_id, uint64 op_id, int output_num,
  bool ready) {
  + if (ctx->GetContextId() != context_id) {
  + // This means that this tensor was pointing to a remote device, which
  + // has been changed out from under us. Simply return since there is
  + // nothing we can do.
  + return;
  + }
  +
  + eager::EagerClient* eager_client;
  + Status status = ctx->GetClient(remote_task, &eager_client);
  + if (!status.ok()) {
  + LOG(INFO) << "Unable to destroy remote tensor handle because the target "
  + << remote_task << " is no longer available.";
  + return;
  + }
  +
  std::unique_ptr<eager::EnqueueRequest> request(new eager::EnqueueRequest);
  request->set_context_id(context_id);
  