MD Settings: Fix styles in several places.

chrome/browser/resources/settings/settings_shared_css.html

 <link rel="import" href="chrome://resources/cr_elements/shared_style_css.html">
 <link rel="import" href="settings_vars_css.html">
 
 <!-- Common styles for Material Design settings. -->
 <dom-module id="settings-shared">
   <template>
     <style include="cr-shared-style">
       /* Included here so we don't have to include "iron-positioning" in every
        * stylesheet. See crbug.com/498405. */
       [hidden] {
@@ skipping 320 matching lines @@
         display: flex;
         flex-shrink: 0;
         height: var(--settings-row-min-height);
       }
 
       .settings-box paper-item iron-icon {
         padding: var(--cr-icon-padding);
       }
 
       /* Helper for a list frame to automatically avoid the separator line. */
-      .vertical-list > *:not(:first-of-type) {
+      .vertical-list > .list-item:not(:first-child) {

[dschuyler, 2017/02/01 23:06:23]

I searched around to see if we use .list-item in all the places we use
.vertical-list. It looks like this file needs to be updated:
chrome/browser/resources/settings/bluetooth_page/bluetooth_page.html
to use .list-item (I didn't see it used) so that this change doesn't break that
page.

[scottchen, 2017/02/02 01:17:14]

I don't actually need to change this, just thought it would be more explicit. I
did a search too, but missed bluetooth_subpage. 
Reverting.

         border-top: var(--settings-separator-line);
       }
 
       .settings-checkbox-spacer {
         -webkit-margin-start: calc(
             var(--checkbox-margin-start) +
             var(--checkbox-size) +
             var(--checkbox-spacing));
       }
 
@@ skipping 34 matching lines @@
       /* Turns the arrow direction downwards, when the bubble is placed above
        * the anchor element */
       .search-bubble-innards.above::after {
         -webkit-transform: rotate(-135deg);
         bottom: -5px;
         top: auto;
       }
     </style>
   </template>
 </dom-module>