Move the security interstitials into a single folder

chrome/browser/resources/security_warnings/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;
@@ skipping 121 matching lines @@
   background-color: rgb(206, 52, 38);
   border-color: rgba(255, 255, 255, .6);
 }
 
 .safe-browsing button:hover {
   box-shadow: 0 2px 3px rgba(0, 0, 0, .5);
 }
 
 .safe-browsing .icon {
   background-image: -webkit-image-set(
-      url(../safe_browsing/images/1x/stop_sign.png) 1x,
-      url(../safe_browsing/images/2x/stop_sign.png) 2x);
+      url(images/1x/stop_sign.png) 1x,
+      url(images/2x/stop_sign.png) 2x);
 }
 
 .small-link {
   color: #696969;
   font-size: .875em;
 }
 
 .ssl .icon {
   background-image: -webkit-image-set(
       url(images/1x/brokenssl_red.png) 1x,
@@ skipping 41 matching lines @@
 
 .styled-checkbox input[type=checkbox]:checked + label::after {
   opacity: 1;
 }
 
 .yellow :-webkit-any(
     a, #details, #details-button, h1, .small-link) {
   color: black;
 }
 
-.yellow .icon {
-  background-image: -webkit-image-set(
-      url(images/1x/brokenssl_yellow.png) 1x,
-      url(images/2x/brokenssl_yellow.png) 2x);
-}
-
 @media (max-width: 700px) {
   .interstitial-wrapper {
     padding: 0 10%;
   }
 }
 
 @media (max-height: 600px) {
   .interstitial-wrapper {
     margin-top: 13%;
   }
@@ skipping 31 matching lines @@
   }
 
   .nav-wrapper {
     margin-top: 30px;
   }
 
   .small-link {
     font-size: 1em;
   }
 }