Delete the old SSL interstitial and Finch trial

chrome/browser/resources/ssl/interstitial_v2.css

 /* Copyright 2014 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. */
 
 a {
   color: #585858;
 }
 
 body {
   background-color: #f7f7f7;
   color: #585858;
   font-size: 125%;
 }
 
 body.safe-browsing {
   background-color: rgb(206, 52, 38);
   color: white;
 }
 
-body.yellow {
-  background-color: rgb(255, 220, 59);
-  color: black;
-}
-
 button {
   background: rgb(76, 142, 250);
   border: 0;
   border-radius: 2px;
   box-sizing: border-box;
   color: #fff;
   cursor: pointer;
   float: right;
   font-size: .875em;
   height: 36px;
@@ skipping 117 matching lines @@
   color: #696969;
   font-size: .875em;
 }
 
 .ssl .icon {
   background-image: -webkit-image-set(
       url(images/1x/brokenssl_red.png) 1x,
       url(images/2x/brokenssl_red.png) 2x);
 }
 
-.ssl-guard #icon {
-  background-image: -webkit-image-set(
-      url(images/1x/brokenssl_guard.png) 1x,
-      url(images/2x/brokenssl_guard.png) 2x);
-  height: 104px;
-  width: 94px;
-}
-
 .styled-checkbox {
   float: left;
   height: 16px;
   margin-top: .36em;
   position: relative;
   width: 16px;
 }
 
 [dir='rtl'] .styled-checkbox {
   float: right;
@@ skipping 85 matching lines @@
   }
 
   .nav-wrapper {
     margin-top: 30px;
   }
 
   .small-link {
     font-size: 1em;
   }
 }