Convert the RSS extension to event pages to avoid a dedicated background process.

chrome/test/data/extensions/subscribe_page_action/popup.js

Index: chrome/test/data/extensions/subscribe_page_action/popup.js
===================================================================
--- chrome/test/data/extensions/subscribe_page_action/popup.js	(revision 190361)
+++ chrome/test/data/extensions/subscribe_page_action/popup.js	(working copy)
@@ -11,7 +11,7 @@
 
 function main() {
   chrome.tabs.getSelected(null, function(tab) {
-    var feeds = chrome.extension.getBackgroundPage().feedData[tab.id];
+    var feeds = JSON.parse(localStorage.getItem(tab.id));

[not at google - send to devlin, 2013/03/28 00:35:05]

I don't fully understand what this is for, but we're encouraging the storage API
over localstorage - and this will be especially useful if it makes sense for
this to be sync'd.

     if (feeds.length == 1) {
       // Only one feed, no need for a bubble; go straight to the subscribe page.
       preview(feeds[0].href);