Стиль не будет применяться к угловым компонентам, вставляемым в iframe

вы можете ввести текстовое поле с помощью java-скрипта.

  <div class="contacts_modal_search">
   <input class="form-control contacts_modal_search_field no_outline ng-pristine ng-valid ng-empty ng-touched" my-focused="" type="search" placeholder="Search" ng-model="search.query" autocomplete="off" style="" id='contacts_modal_search_field'>
  <a class="im_dialogs_search_clear tg_search_clear ng-hide" ng-click="search.query = ''" ng-show="search.query.length" style="">
    <i class="icon icon-search-clear"></i>
  </a>
</div>
<script>
window.onload=function(){
//by Class name
document.getElementsByClassName('contacts_modal_search_field')[0].value='Something'

//by Id 
document.getElementById('contacts_modal_search_field')[0].value='Something' //if 'contacts_modal_search_field' is your input box ID

//By Tag name
document.getElementsByTagName('input')[0].value='Something'
}
</script>