Add quiet safe browsing interstitial for WebView

components/security_interstitials/core/browser/resources/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;
-}
-
 .bad-clock .icon {
   background-image: -webkit-image-set(
       url(images/1x/clock.png) 1x,
       url(images/2x/clock.png) 2x);
 }
 
-body {
-  background-color: #f7f7f7;
-  color: #646464;
-}
-
 body.safe-browsing {
   background-color: rgb(206, 52, 38);
   color: white;
 }
 
 button {
   -webkit-user-select: none;
   background: rgb(66, 133, 244);
   border: 0;
   border-radius: 2px;
@@ skipping 44 matching lines @@
 
 #details {
   color: #696969;
   margin: 45px 0 50px;
 }
 
 #details p:not(:first-of-type) {
   margin-top: 20px;
 }
 
-#details-button {
-  background: inherit;
-  border: 0;
-  float: none;
-  margin: 0;
-  padding: 10px 0;
-  text-transform: uppercase;
-}
-
 #details-button:hover {
   box-shadow: inherit;
   text-decoration: underline;
 }
 
 .error-code {
   color: #646464;
   font-size: .86667em;
   text-transform: uppercase;
 }
 
 #error-debugging-info {
   font-size: 0.8em;
 }
 
 h1 {
   color: #333;
   font-size: 1.6em;
   font-weight: normal;
   line-height: 1.25em;
   margin-bottom: 16px;
 }
 
 h2 {
   font-size: 1.2em;
   font-weight: normal;
 }
 
-.hidden {
-  display: none;
-}
-
-html {
-  -webkit-text-size-adjust: 100%;
-  font-size: 125%;
-}
-
 .icon {
-  background-repeat: no-repeat;
-  background-size: 100%;
   height: 72px;
   margin: 0 0 40px;
   width: 72px;
 }
 
 input[type=checkbox] {
   opacity: 0;
 }
 
 input[type=checkbox]:focus ~ .checkbox {
@@ skipping 382 matching lines @@
     width: 100%;
   }
 }
 
 @media (max-width: 239px) and (orientation: portrait) {
   .nav-wrapper {
     padding-left: 0;
     padding-right: 0;
   }
 }