MD Settings: fix settings-toggle-button label text overflow.

chrome/browser/resources/settings/controls/settings_toggle_button.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-toggle-button/paper-toggle-button.html">
 <link rel="import" href="/controls/settings_boolean_control_behavior.html">
 <link rel="import" href="/settings_shared_css.html">
 
 <dom-module id="settings-toggle-button">
   <template>
     <style include="settings-shared">
+      :host([elide-label]),
+      :host([elide-label]) #outerRow,
+      :host([elide-label]) #outerRow > div.flex {
+        min-width: 0;
+      }
+
+      :host([elide-label]) .label {
+        @apply(--settings-text-elide);
+      }
+
       #outerRow {
         align-items: center;
         display: flex;
         min-height: var(--settings-row-two-line-min-height);
         width: 100%;
       }
 
       #outerRow[noSubLabel] {
         min-height: var(--settings-row-min-height);
       }
 
       paper-toggle-button,
       cr-policy-pref-indicator {
         -webkit-margin-start: var(--checkbox-spacing);
       }
 
       ::content .more-actions {
         -webkit-margin-end: 10px;
       }
     </style>
     <div id="outerRow" noSubLabel$="[[!subLabel]]">
       <div class="flex" on-tap="onLabelWrapperTap_"
           actionable$="[[!controlDisabled_(disabled, pref)]]">
-        <div>[[label]]</div>
-        <div class="secondary">[[subLabel]]</div>
+        <div class="label">[[label]]</div>
+        <div class="secondary label">[[subLabel]]</div>
       </div>
       <content selector=".more-actions"></content>
       <template is="dom-if" if="[[pref.controlledBy]]">
         <cr-policy-pref-indicator pref="[[pref]]"></cr-policy-pref-indicator>
       </template>
       <paper-toggle-button id="control" checked="{{checked}}"
           disabled="[[controlDisabled_(disabled, pref)]]">
       </paper-toggle-button>
     </div>
   </template>
   <script src="settings_toggle_button.js"></script>
 </dom-module>