Remove import ONC option from internet settings (to be moved to net-internals).

chrome/browser/resources/options/chromeos/internet_options_page.css

 #inetTitle {
   border: none;
 }
 
 #network-general-div {
   -webkit-margin-start: 15px;
 }
 
 #networking-controls {
   display: -webkit-box;
@@ skipping 53 matching lines @@
   line-height: 100%;
   max-width: 320px;
   overflow: hidden;
   vertical-align: middle;
 }
 
 html[dir='rtl'] .network-item-text {
   background: right center no-repeat;
 }
 
-input[type='file'] {
-  margin-top: 5px;
-}
-
-#import-network-settings {
-  margin-top: 10px;
-}
 .network-item[connected] > * > .network-name-label {
   font-weight: bold;
 }
 
 .network-status-label {
   color: grey;
 }
 
 .network-item > * > button {
   min-width: 100px;
@@ skipping 69 matching lines @@
 }
 
 #ipConfigList .name {
   width: 40%;
 }
 
 #ipConfigList .value {
   -webkit-box-flex: 1;
   color: #666;
 }