Move another bunch of extension API tests to manifest_version 2.

chrome/test/data/extensions/api_test/content_scripts/dont_match_host_permissions/manifest.json

 {
   "name": "content script don't match host permissions",
   "version": "1.0",
+  "manifest_version": 2,
   "description": "Tests that content scripts don't match host permissions.",
   "background_page": "background.html",
   "permissions": [
     "tabs",
     "http://b.com/*"
   ],
   "content_scripts": [
     {
       "matches": ["http://a.com/*"],
       "js": ["modify.js"],
       "run_at": "document_end"
     },
     {
       "matches": ["<all_urls>"],
       "js": ["test.js"],
       "run_at": "document_end"
     }
   ]
 }