Parse labels under File resource.

chrome/test/data/chromeos/drive/filelist.json

 {
  "kind": "drive#fileList",
  "etag": "\"WtRjAPZWbDA7_fkFjc5ojsEvDEF/zyHTfoHpnRHovyi8bWpwK0DXABC\"",
  "selfLink": "https://www.googleapis.com/drive/v2/files",
  "nextPageToken": "EAIaggELEgA6egpi96It9mH_____f_8AAP__AAD_okhU-cHLz83KzszMxsjMzs_RyNGJnridyrbHs7u9tv8AAP__AP7__n__AP8AokhU-cHLz83KzszMxsjMzs_RyNGJnridyrbHs7u9tv8A__4QZCEiXPTi_wtIgTkAAAAAngnSXUgCDEAAIgsJPgart10AAAAABC",
  "nextLink": "https://www.googleapis.com/drive/v2/files?pageToken=EAIaggELEgA6egpi96It9mH_____f_8AAP__AAD_okhU-cHLz83KzszMxsjMzs_RyNGJnridyrbHs7u9tv8AAP__AP7__n__AP8AokhU-cHLz83KzszMxsjMzs_RyNGJnridyrbHs7u9tv8A__4QZCEiXPTi_wtIgTkAAAAAngnSXUgCDEAAIgsJPgart10AAAAABC",
  "items": [
   {
    "kind": "drive#file",
    "id": "0B4v7G8yEYAWHUmRrU2lMS2hLABC",
@@ skipping 48 matching lines @@
    "id": "1Pc8jzfU1ErbN_eucMMqdqzY3eBm0v8sxXm_1CtLxABC",
    "etag": "\"WtRjAPZWbDA7_fkFjc5ojsEvDEF/MTM0MzM2NDg1MTAXYZ\"",
    "selfLink": "https://www.googleapis.com/drive/v2/files/1Pc8jzfU1ErbN_eucMMqdqzY3eBm0v8sxXm_1CtLxABC",
    "alternateLink": "https://docs.google.com/a/chromium.org/document/d/1Pc8jzfU1ErbN_eucMMqdqzY3eBm0v8sxXm_1CtLxABC/edit",
    "embedLink": "https://docs.google.com/a/chromium.org/document/d/1Pc8jzfU1ErbN_eucMMqdqzY3eBm0v8sxXm_1CtLxABC/preview",
    "thumbnailLink": "https://docs.google.com/feeds/vt?gd=true&id=1Pc8jzfU1ErbN_eucMMqdqzY3eBm0v8sxXm_1CtLxABC&v=3&s=AMedNnoAAAAAUBJyB0g8HbxZaLRnlztxefZPS24LiXYZ&sz=s220",
    "title": "Test Google Document",
    "mimeType": "application/vnd.google-apps.document",
    "labels": {
     "starred": true,
-    "hidden": false,
-    "trashed": false,
-    "restricted": false,
+    "hidden": true,
+    "trashed": true,
+    "restricted": true,
     "viewed": true
    },
    "createdDate": "2012-07-27T04:54:09.686Z",
    "modifiedDate": "2012-07-27T04:54:11.030Z",
    "modifiedByMeDate": "2012-07-27T04:54:11.030Z",
    "lastViewedByMeDate": "2012-07-27T04:54:11.030Z",
    "exportLinks": {
     "application/msword": "https://docs.google.com/feeds/download/documents/export/Export?id=1Pc8jzfU1ErbN_eucMMqdqzY3eBm0v8sxXm_1CtLxABC&exportFormat=doc",
     "text/html": "https://docs.google.com/feeds/download/documents/export/Export?id=1Pc8jzfU1ErbN_eucMMqdqzY3eBm0v8sxXm_1CtLxABC&exportFormat=html",
     "application/pdf": "https://docs.google.com/feeds/download/documents/export/Export?id=1Pc8jzfU1ErbN_eucMMqdqzY3eBm0v8sxXm_1CtLxABC&exportFormat=pdf"
@@ skipping 51 matching lines @@
    "quotaBytesUsed": "0",
    "ownerNames": [
     "Test User"
    ],
    "lastModifyingUserName": "Test User",
    "editable": true,
    "writersCanShare": true
   }
  ]
 }