Convert RSS extension to use manifest version 2 (with CSP protection).

chrome/test/data/extensions/subscribe_page_action/manifest.json

Index: chrome/test/data/extensions/subscribe_page_action/manifest.json
===================================================================
--- chrome/test/data/extensions/subscribe_page_action/manifest.json	(revision 137495)
+++ chrome/test/data/extensions/subscribe_page_action/manifest.json	(working copy)
@@ -1,27 +1,32 @@
 {
-   "background": {
-     "page": "background.html"
-   },
-   "content_scripts": [ {
-      "js": [ "sniff_common.js", "doc_start.js" ],
-      "matches": [ "http://*/*", "https://*/*" ],
-      "run_at": "document_start"
-   }, {
-      "js": [ "sniff_common.js", "feed_finder.js" ],
-      "matches": [ "http://*/*", "https://*/*" ]
-   } ],
-   "default_locale": "en",
-   "description": "__MSG_rss_subscription_description__",
-   "icons": {
-      "128": "feed-icon-128x128.png"
-   },
-   "name": "__MSG_rss_subscription_name__",
-   "options_page": "options.html",
-   "page_action": {
-      "default_icon": "feed-icon-16x16.png",
-      "default_title": "__MSG_rss_subscription_default_title__",
-      "popup": "popup.html"
-   },
-   "permissions": [ "tabs", "http://*/*", "https://*/*" ],
-   "version": "2.1.3"
+  "background": {
+    "scripts": ["background.js"]
+  },
+  "content_scripts": [ {
+    "js": [ "sniff_common.js", "doc_start.js" ],
+    "matches": [ "http://*/*", "https://*/*" ],
+    "run_at": "document_start"
+  }, {
+    "js": [ "sniff_common.js", "feed_finder.js" ],
+    "matches": [ "http://*/*", "https://*/*" ]
+  } ],
+  "default_locale": "en",
+  "description": "__MSG_rss_subscription_description__",
+  "icons": {
+    "128": "feed-icon-128x128.png"
+  },
+  "manifest_version": 2,
+  "name": "__MSG_rss_subscription_name__",
+  "options_page": "options.html",
+  "page_action": {
+    "default_icon": "feed-icon-16x16.png",
+    "default_title": "__MSG_rss_subscription_default_title__",
+    "default_popup": "popup.html"
+  },
+  "permissions": [ "tabs", "http://*/*", "https://*/*" ],
+  "version": "2.2.0",
+  "web_accessible_resources": [
+    "iframe.js",
+    "style.css"
+  ]
 }