[MD settings] not clipping ink ripple in spelling settings

chrome/browser/resources/settings/on_startup_page/startup_url_entry.html

 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/icon.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-dropdown/iron-dropdown.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-item/paper-item.html">
 <link rel="import" href="/on_startup_page/startup_urls_page_browser_proxy.html">
 <link rel="import" href="/settings_shared_css.html">
 
 <dom-module id="settings-startup-url-entry">
   <template>
     <style include="settings-shared">
       .dropdown-content {
         background: white;
         box-shadow: 0 2px 6px grey;
       }
 
+      .hide-overflow {
+        overflow: hidden;
+      }
+
       paper-item:hover {
         background-color: var(--settings-hover-color);
       }
     </style>
     <div class="list-item underbar">
       <div class="favicon-image"
           style="background-image: [[getIconSet_(model.url)]]">
       </div>
-      <div class="middle">
+      <div class="middle hide-overflow">

[michaelpg, 2016/06/13 16:01:57]

[Why] is this the only place this is necessary?

[dschuyler, 2016/06/13 19:25:19]

I'd like to start here and expand as necessary.
I'll move the class if it is used in 2+ places.
I created a bug to track the question with Alan
about what should/shouldn't elide or wrap.

https://bugs.chromium.org/p/chromium/issues/detail?id=619670

         <div class="text-elide">[[model.title]]</div>
         <div class="text-elide secondary">[[model.url]]</div>
       </div>
       <paper-icon-button id="dots" icon="cr:more-vert" toggles
           active="{{menuOpened}}"></paper-icon-button>
       <template is="dom-if" if="[[menuOpened]]">
         <iron-dropdown vertical-align="top" horizontal-align="right"
             opened="{{menuOpened}}">
           <div class="dropdown-content">
             <paper-item on-tap="onEditTap_">$i18n{onStartupEdit}</paper-item>
             <paper-item id="remove" on-tap="onRemoveTap_">
               $i18n{onStartupRemove}
             </paper-item>
           </div>
         </iron-dropdown>
       </template>
     </div>
   </template>
   <script src="startup_url_entry.js"></script>
 </dom-module>