Remove WebUI NTP on Android.

chrome/browser/resources/ntp_android/opentabs.css

-/* Copyright (c) 2012 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. */
-
-.list-item {
-  -webkit-tap-highlight-color: transparent;
-  -webkit-transition: 300ms linear;
-  -webkit-transition-property: background;
-  background: transparent;
-  height: 50px;
-  padding-bottom: auto;
-  padding-top: auto;
-  position: relative; /* So the fader can be positioned at the end */
-}
-
-.list-item-active,
-.session-header .list-item.list-item-active {
-  -webkit-tap-highlight-color: transparent;
-  background: rgba(51, 181, 229, 0.4);
-}
-
-.list-item-active.no-active-delay {
-  -webkit-transition: none;
-}
-
-.list-item.standard-divider {
-  border-bottom: 1px solid #c1c1c1;
-}
-
-.list-item .section-divider {
-  background-color: #777;
-  bottom: 0;
-  height: 2px;
-  position: absolute;
-  width: 100%;
-}
-
-.list-item .icon {
-  background-position: center center;
-  background-repeat: no-repeat;
-  background-size: 24px;
-  height: 48px;
-  position: absolute;
-  width: 48px;
-}
-
-html[dir='ltr'] .list-item .icon {
-  left: 0;
-}
-
-html[dir='rtl'] .list-item .icon {
-  right: 0;
-}
-
-.list-item .title {
-  -webkit-box-align: center;
-  color: #4c4c4c;
-  display: -webkit-box;
-  font-size: 16px;
-  height: 100%;
-  overflow: hidden;
-  position: absolute;
-  top: 0;
-  white-space: nowrap;
-}
-
-html[dir='ltr'] .list-item .title {
-  -webkit-mask-image: linear-gradient(
-    to right,
-    rgba(0,0,0,1),
-    rgba(0,0,0,1) 85%,
-    rgba(0,0,0,0) 95%,
-    rgba(0,0,0,0))
-  );
-  left: 50px;
-  right: 0;
-}
-
-html[dir='rtl'] .list-item .title {
-  -webkit-mask-image: linear-gradient(
-    to right,
-    rgba(0,0,0,0)),
-    rgba(0,0,0,0) 5%,
-    rgba(0,0,0,1) 15%,
-    rgba(0,0,0,1))
-  );
-  left: 0;
-  right: 50px;
-}
-
-.list-item .session_container {
-  width: 100%;
-}
-
-.list-item .session_title {
-  display: inline-block;
-  line-height: 50px;
-}
-
-.session-header .list-item {
-  background: #ebebeb;
-}
-
-.title .session-name {
-  color: #4c4c4c;
-  font-weight: bold;
-}
-
-.title .session-last-synced {
-  color: #8f8f8f;
-  font-weight: bold;
-}
-
-.session-children-container {
-  -webkit-transition: height 200ms ease-in-out;
-  height: 100%; /* needed for collapse animation */
-  overflow: hidden;
-}
-
-.session-header {
-  position: relative;
-}
-
-.expando {
-  background-size: 100%;
-  height: 13px;
-  margin-top: -6.5px;
-  position: absolute;
-  top: 50%;
-  width: 14px;
-}
-
-html[dir='ltr'] .expando {
-  right: 18.5px;
-}
-
-html[dir='rtl'] .expando {
-  left: 18.5px;
-}
-
-.expando.open {
-  background-image: url(images/disclosure_open_mdpi.png);
-}
-
-html[dir='rtl'] .expando.open {
-  -webkit-transform: scaleX(-1);
-}
-
-.expando.closed {
-  background-image: url(images/disclosure_closed_mdpi.png);
-}
-
-html[dir='rtl'] .expando.closed {
-  -webkit-transform: scaleX(-1);
-}
-
-.session-icon.laptop {
-  background-image: url(../../../../ui/webui/resources/images/laptop.png);
-}
-
-html[dir='rtl'] .session-icon.laptop {
-  -webkit-transform: scaleX(-1);
-}
-
-.session-icon.tablet {
-  background-image: url(../../../../ui/webui/resources/images/tablet.png);
-}
-
-html[dir='rtl'] .session-icon.tablet {
-  -webkit-transform: scaleX(-1);
-}
-
-.session-icon.phone {
-  background-image: url(../../../../ui/webui/resources/images/phone.png);
-}
-
-html[dir='rtl'] .session-icon.phone {
-  -webkit-transform: scaleX(-1);
-}
-
-.session-icon.documents {
-  background-image: url(images/sent_mdpi.png);
-}
-
-html[dir='rtl'] .session-icon.documents {
-  -webkit-transform: scaleX(-1);
-}
-
-@media screen and (-webkit-min-device-pixel-ratio: 1.5) {
-  .expando.open {
-    background-image: url(images/disclosure_open_hdpi.png);
-  }
-  .expando.closed {
-    background-image: url(images/disclosure_closed_hdpi.png);
-  }
-  .session-icon.laptop {
-    background-image:
-        url(../../../../ui/webui/resources/images/1.5x/laptop.png);
-  }
-  .session-icon.tablet {
-    background-image:
-        url(../../../../ui/webui/resources/images/1.5x/tablet.png);
-  }
-  .session-icon.phone {
-    background-image: url(../../../../ui/webui/resources/images/1.5x/phone.png);
-  }
-  .session-icon.documents {
-    background-image: url(images/sent_hdpi.png);
-  }
-}
-
-@media screen and (-webkit-min-device-pixel-ratio: 2.0) {
-  .expando.open {
-    background-image: url(images/disclosure_open_xhdpi.png);
-  }
-  .expando.closed {
-    background-image: url(images/disclosure_closed_xhdpi.png);
-  }
-  .session-icon.laptop {
-    background-image: url(../../../../ui/webui/resources/images/2x/laptop.png);
-  }
-  .session-icon.tablet {
-    background-image: url(../../../../ui/webui/resources/images/2x/tablet.png);
-  }
-  .session-icon.phone {
-    background-image: url(../../../../ui/webui/resources/images/2x/phone.png);
-  }
-  .session-icon.documents {
-    background-image: url(images/sent_xhdpi.png);
-  }
-}
-
-.session-icon {
-  background-position: center;
-  background-repeat: no-repeat;
-  background-size: 32px 32px;
-  height: 48px;
-  width: 48px;
-}