[MD settings] removing .css files from internet settings

chrome/browser/resources/settings/internet_page/network_proxy_exclusions.html

 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 
 <dom-module id="network-proxy-exclusions">
-  <link rel="import" type="css" href="network_proxy_exclusions.css">
   <template>
+    <style>
+      span {
+        margin: 5px;
+      }
+
+      iron-icon {
+        margin: 5px;
+      }
+
+      div#container {
+        border: 1px solid lightgrey;
+        height: 100px;
+        margin: 5px;
+        overflow-y: auto;
+      }
+    </style>
     <div id="container" class="layout vertical">
       <template is="dom-repeat" items="[[exclusions]]">
         <div class="layout horizontal">
           <span class="flex">[[item]]</span>
           <iron-icon icon="cr:clear" on-tap="onRemoveTap_">
           </iron-icon>
         </div>
       </template>
     </div>
   </template>
   <script src="network_proxy_exclusions.js"></script>
 </dom-module>