Update more extension manifests to manifest_version 2

chrome/test/data/extensions/browsertest/crash_25562/manifest.json

 {
    "background_page": "background.html",
    "content_scripts": [ {
       "js": [ "script.js" ],
       "matches": [ "http://*/*" ]
    } ],
    "description": "A page action with incorrect icon specification",
    "name": "Test extension",
    "page_actions": [ {
       "icon": "chrome-16.png",
       "id": "TestId",
       "name": "Page action name",
       "tooltip": "Page action tooltip"
    } ],
    "permissions": [ "http://*/*" ],
+   "manifest_version": 2,
    "version": "1.0"
 }