Source (src) is given inside <iframe> tag
<iframe src="{{ $contact->map }}"
width="600"
height="450"
frameborder="0"
style="border:0" allowfullscreen>
</iframe>
Full code with div and class
<div class="form-group">
<label class="col-sm-3 control-label no-padding-right" for="form-field-1">Cuurrent Location</label>
<div class="col-sm-9">
<iframe src="{{ $contact->map }}"
width="600"
height="450"
frameborder="0"
style="border:0" allowfullscreen>
</iframe>
</div>
</div>
Please note that only src attributes of iframe is assigned which can be retrived from iframe tag of any google map.