Change bug for disabled RemoteFileSystemExtensionApiTest.RemoteMountPoint test.

chrome/test/data/chromeos/gdata/remote_file_system_apitest_root_feed.json

 {
    "encoding": "UTF-8",
    "feed": {
       "author": [ {
          "email": {
             "$t": "tester@testing.com"
          },
          "name": {
             "$t": "tester"
          }
@@ skipping 101 matching lines @@
             "src": "https://file_content_url/",
             "type": "audio/mpeg"
          },
          "docs$filename": {
             "$t": "File.aBc"
          },
          "docs$md5Checksum": {
             "$t": "3b4382ebefec6e743578c76bbd0575ce"
          },
          "docs$size": {
-            "$t": "892721"
+            "$t": "13"
          },
          "docs$suggestedFilename": {
             "$t": "File.aBc"
          },
          "docs$writersCanInvite": {
             "value": "true"
          },
          "gd$etag": "\"HhMOFgxXHit7ImBr\"",
          "gd$feedLink": [ {
             "href": "https://file_feed_link_url",
@@ skipping 90 matching lines @@
       },
       "xmlns": "http://www.w3.org/2005/Atom",
       "xmlns$batch": "http://schemas.google.com/gdata/batch",
       "xmlns$docs": "http://schemas.google.com/docs/2007",
       "xmlns$gd": "http://schemas.google.com/g/2005",
       "xmlns$openSearch": "http://a9.com/-/spec/opensearch/1.1/"
    },
    "version": "1.0"
 }