add chrome support; fix two text grabbing problems; eliminate unused lookup queue concept

background.html

@@ -1,6 +1,7 @@
 <html>
 <head><meta charset="utf-8"/></head>
 <body>
+<script src="include/browser-polyfill.min.js" charset="UTF-8"></script>
 <script src="background-script.js" charset="UTF-8"></script>
 <textarea id="nazeka-paste-target"></textarea>
 </body>