Update ChromeVox manifest to use the version 2 manifest.

BUG=none
TBR=zelidrag

Review URL: https://chromiumcodereview.appspot.com/10823122

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150021 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/resources/chromeos/access_chromevox/manifest.json

 {
   "key": "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDltVl1k15pjRzuZfMc3B69inxwm2bZeZ2O8/zFO+NluHnBm3GJ3fzdOoFGJd+M16I8p7zxxQyHeDMfWYASyCeB8XnUEDKjqNLQfCnncsANzHsYoEbYj2nEUML2P13b9q+AAvpCBpAJ4cZp81e9n1y/vbSXHE4385cgkKueItzikQIDAQAB",
+  "manifest_version": 2,
   "name": "ChromeVox",
   "version": "1.0",
   "description": "ChromeVox - Giving Voice to Chrome.",
@@ -23,5 +24,8 @@
       ]
     }
   ],
+  "web_accessible_resources": [
+    "chromevox/injected/api.js"
+  ],
   "default_locale": "en"
 }