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

chrome/browser/resources/history/history.css

Index: chrome/browser/resources/history/history.css
diff --git a/chrome/browser/resources/history/history.css b/chrome/browser/resources/history/history.css
index 3cf0bd0aee6ba3277f2ed4546c17975014eb32e8..810aa55ae9872412097a8ccdf1efdb9fa9356a68 100644
--- a/chrome/browser/resources/history/history.css
+++ b/chrome/browser/resources/history/history.css
@@ -38,15 +38,23 @@ html[dir='rtl'] #notification-bar {
   float: left;
 }
 
-#notification-bar.alone {
+#top-container.overflow #notification-bar {
   float: left;
   margin-top: 12px;
 }
 
-html[dir='rtl'] #notification-bar.alone {
+html[dir='rtl'] #top-container.overflow #notification-bar {
   float: right;
 }
 
+#notification-bar span {
+  display: block;
+}
+
+#notification-bar span + span {
+  margin: 1em 0;
+}
+
 #filter-controls,
 #top-container,
 #results-display,
@@ -73,6 +81,10 @@ html[dir='rtl'] #editing-controls {
   float: right;
 }
 
+#top-container.overflow #editing-controls {
+  float: none;
+}
+
 #editing-controls button:first-of-type {
   -webkit-margin-start: 0;
 }