MD Settings: Site settings, remove unwanted margin before dropdown.

chrome/browser/resources/settings/settings_shared_css.html

 <link rel="import" href="chrome://resources/cr_elements/shared_style_css.html">
 <link rel="import" href="/settings_vars_css.html">
 
 <!-- Common styles for Material Design settings. -->
 <dom-module id="settings-shared">
   <template>
     <style include="cr-shared-style">
       button[is='paper-icon-button-light'] {
         --paper-icon-button-light-ripple: {
           /* Center the ripple on the icon button. */
@@ skipping 234 matching lines @@
 
       /* A thin separator line under a list item. */
       .list-item.underbar {
         border-bottom: var(--settings-separator-line);
       }
 
       .list-item.selected {
         font-weight: 500;
       }
 
-      .list-item select {
-        -webkit-margin-start: 4px;
-      }
-
       /* The middle part (horizontally) of a list item. */
       .list-item .middle {
         flex: 1;
         margin: 8px 16px;
       }
 
       /* The start (left in LTR) part (horizontally) of a list item. */
       .list-item > .start {
         flex: 1;
       }
@@ skipping 159 matching lines @@
       /* Turns the arrow direction downwards, when the bubble is placed above
        * the anchor element */
       .search-bubble-innards.above::after {
         -webkit-transform: rotate(-135deg);
         bottom: -5px;
         top: auto;
       }
     </style>
   </template>
 </dom-module>