DOMUI Prefs: Replace search engine edit overlay with inline editing.

chrome/browser/resources/options/options_page.css

 body {
   -webkit-user-select: none;
   cursor: default;
   font-size: 100%;
 }
 
 #settings-title {
   -webkit-padding-end: 24px;
   color: #53637d;
   font-size: 200%;
@@ skipping 399 matching lines @@
 list > .heading:hover {
   background-color: transparent;
   border-color: transparent;
 }
 
 list .deletable-item {
   -webkit-box-align: center;
 }
 
 list .deletable-item > :first-child {
+  -webkit-box-align: center;
   -webkit-box-flex: 1;
+  -webkit-padding-end: 3px;
   display: -webkit-box;
 }
 
 list .close-button {
   -webkit-transition: .15s opacity;
   background-color: transparent;
   /* TODO(stuartmorgan): Replace with real images once they are available. */
   background-image: url("../../../app/theme/close_bar.png");
   border: none;
   height: 16px;
@@ skipping 92 matching lines @@
 }
 
 .suboption {
   -webkit-margin-start: 16px;
 }
 
 html[os=mac] label > input[type=checkbox],
 html[os=mac] label > input[type=radio] {
   margin-top: 2px;
 }