[MD settings] adjust button layout

chrome/browser/resources/settings/passwords_and_forms_page/passwords_shared_css.html

 <!-- Common styles for Passwords and Forms -->
 <dom-module id="passwords-shared">
   <template>
     <style>
       :host {
         display: flex;
         flex-direction: column;
       }
 
-      paper-icon-button {
-        @apply(--cr-paper-icon-button-margin);
-        color: var(--paper-grey-600);
-        flex-shrink: 0;
-      }
-
       .list-with-header > div:first-of-type {
         border-top: var(--settings-separator-line);
       }
 
       .website-column {
         display: flex;
         flex: 3;
       }
 
       .username-column {
         flex: 2;
         margin: 0 8px;
       }
 
       .password-column {
         align-items: center;
         display: flex;
         flex: 2;
       }
-      
+
       .password-field {
         background-color: transparent;
         border: none;
         flex: 1;
         height: 20px;
         width: 0;
       }
 
       .selectable {
         -webkit-user-select: text;
       }
     </style>
   </template>
 </dom-module>