MD Settings: Internet: Add 'forget' button, more fixes.

chrome/browser/resources/settings/internet_page/network_summary_item.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-spinner/paper-spinner.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-toggle-button/paper-toggle-button.html">
 <link rel="import" href="chrome://resources/cr_elements/cr_expand_button/cr_expand_button.html">
 <link rel="import" href="chrome://resources/cr_elements/network/cr_network_list.html">
 <link rel="import" href="chrome://resources/cr_elements/network/cr_network_list_network_item.html">
 <link rel="import" href="/settings_shared_css.html">
 
 <dom-module name="network-summary-item">
   <template>
     <style include="settings-shared">
       :host {
         --cr-network-icon-mixin: {
           height: 24px;
           left: -4px;
           width: 24px;
         }
         --cr-network-name-mixin: {
           font-size: inherit;
         };
         --cr-network-state-mixin: {
           @apply(--settings-secondary);
           font-size: inherit;
         };
       }
 
       paper-spinner {
-        -webkit-margin-start: 20px;
+        height: 20px;
+        margin: 0 20px;
+        width: 20px;
       }
 
       .button-row {
         align-items: center;
         border-top: var(--settings-separator-line);
         display: flex;
         min-height: var(--settings-row-min-height);
       }
 
       #buttons {
         align-items: center;
       }
 
       #deviceEnabledButton {
         -webkit-margin-start: 10px;
       }
 
       #networkList {
         margin: 5px 0 10px;
         max-height: 400px;
       }
     </style>
     <div class="settings-box two-line">
-      <div id="details" class="start" on-tap="onDetailsTap_" actionable>
-        <cr-network-list-network-item id="detailsItem"
+      <div id="details" actionable class="start layout horizontal center"
+          on-tap="onDetailsTap_">
+        <cr-network-list-network-item class="flex"
             network-state="[[activeNetworkState]]" show-buttons>
         </cr-network-list-network-item>
         <paper-spinner active="[[showScanning_(deviceState, expanded)]]">
         </paper-spinner>
       </div>
       <div>
         <div id="buttons" class="layout horizontal">
           <template is="dom-if"
               if="[[expandIsVisible_(deviceState, networkStateList)]]">
             <cr-expand-button id="expandListButton" expanded="{{expanded}}">
@@ skipping 22 matching lines @@
             <paper-button on-tap="onKnownNetworksTap_">
               Known networks
             </paper-button>
           </div>
         </template>
       </div>
     </template>
   </template>
   <script src="network_summary_item.js"></script>
 </dom-module>