MD Settings: Manage search engines 3/3, hooking up UI.

chrome/browser/resources/settings/search_engines_page/search_engine_entry.css

 /* Copyright (c) 2015 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file. */
 
 .name-column,
 .keyword-column {
-  flex: 2;
+  flex: 3;
 }
 
 .name-column {
   display: flex;
 }
 
 .url-column {
-  flex: 5;
+  flex: 3.5;
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
 }
 
 .icon-container {
   flex: 1;
+  margin: auto;
   text-align: center;
 }
 
 .name {
   flex: 3;
+  margin: auto;
 }
 
 #container {
   border-top: 1px solid lightgray;
   display: flex;
   padding: 10px 0;
 }
 
 .dropdown-content {
   background: white;
   box-shadow: 0 2px 6px grey;
 }
 
 paper-item:hover {
   background-color: #f0f0f0;
 }