Add a notice about other forms of browsing history to the History WebUI.

chrome/browser/resources/history/history_mobile.css

 /* Copyright (c) 2013 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. */
 
 /* This file contains styles specific to Android and iOS. */
 
 html:not(.focus-outline-visible) :focus {
   outline: none;
 }
 
 html {
   height: 100%;
 }
 
 body {
+  background-color: rgba(0, 0, 0, .05);
   color: rgb(76, 76, 76);
   font-size: initial;
   height: 100%;
   margin: 0;
 }
 
 .page {
   -webkit-flex-flow: column;
   display: -webkit-flex;
   height: 100%;
 }
 
 #scrolling-container {
   -webkit-flex: auto;  /* Container should take up extra vertical space. */
   -webkit-overflow-scrolling: touch;
   overflow-y: auto;
 }
 
 h1 {
+  color: rgb(34, 34, 34);
   font-weight: bold;
   margin-bottom: 12px;
 }
 
 #top-container,
 #results-display {
   margin: 0;
 }
 
 #top-container,
@@ skipping 35 matching lines @@
   display: block;
   line-height: 1.5;
   margin-top: 16px;
   width: 100%;
 }
 
 html[dir='rtl'] #search-field {
   background-position: right 16px center;
 }
 
-#notification-bar.alone {
+#notification-bar {
+  color: rgb(138, 138, 138);
+  font-size: 14px;
+  line-height: 1.5;
+}
+
+#notification-bar span {
+  /* On desktop, notification spans are displayed as separate paragraphs.
+     On mobile, join them into a single paragraph. */

[Dan Beam, 2016/04/01 15:32:18]

/* ...
 * ... */
 ^

+  display: inline;
+}
+
+#top-container.overflow #notification-bar {
   float: none;
-  font-size: 75%;
   margin: 0;
   padding-bottom: 0;
   padding-top: 0;
 }
 
 #remove-selected,
 #search-button,
 .gap {
   display: none;
 }
@@ skipping 13 matching lines @@
   opacity: 0.7;
   padding: 0 16px;
   vertical-align: top;
   width: 45px;
 }
 
 button.remove-entry:active {
   opacity: 1.0;
 }
 
+.entry {
+  background-color: white;
+}
+
 .entry-box {
   margin-bottom: 0;
   margin-top: 0;
   padding-bottom: 0;
 }
 
 h3,
 .entry,
 #search-field {
   border-bottom: 1px solid rgb(220, 220, 220);
@@ skipping 201 matching lines @@
 
 .ios-keyboard-visible #scrolling-container {
   /* Should be 0, but that breaks scrolling -- see crbug.com/292715. */
   bottom: -1px;
 }
 
 #results-header:empty {
   display: none;
 }
 </if> /* is_ios */