[Android] Use fallback icon if there is no large favicon on the history page

ui/webui/resources/js/cr.js

Index: ui/webui/resources/js/cr.js
diff --git a/ui/webui/resources/js/cr.js b/ui/webui/resources/js/cr.js
index a38c59f84732e820c00407287b3ef00c37b41bb2..869b103cb9e00889b4562556af812eb3a47674ed 100644
--- a/ui/webui/resources/js/cr.js
+++ b/ui/webui/resources/js/cr.js
@@ -431,5 +431,10 @@ var cr = function() {
     get isLinux() {
       return /Linux/.test(navigator.userAgent);
     },
+
+    /** Whether this is on Android. */
+    get isAndroid() {
+      return /Android/.test(navigator.userAgent);
+    }
   };
 }();