Throwing custom validation exceptions/errors in Laravel 5.3

I am upgrading Laravel from 5.2 to 5.3. In 5.2, I was throwing Illuminate\Contracts\Validation\ValidationException (using my own validation logic) like so:

$this->errors = new MessageBag();
...
ValidationException($this->errors);

In 5.3, Illuminate\Contracts\Validation\ValidationException is removed. How do I keep the same blade output behaviour? Do I simply recreate ValidationException?

// In blade, this should still print error. (JSON should keep same behaviour too)
@if (count($errors) > 0)
    <div class="alert alert-danger">
        <ul>
            @foreach ($errors->all() as $error)
                <li></li>
            @endforeach
        </ul>
    </div>
@endif

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