GitLab

- Added new ErrorCode enum to pass error codes everywhere except between 
  the webapp and the plugin.
- Signaling timeout when connection now is interpreted as disconnect instead of
  error condition (see bug 112739).
- Fixed webapp to properly handle unknown error codes.

BUG=112739


Review URL: http://codereview.chromium.org/9567033

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@124606 0039d316-1c4b-4281-b951-d872f2087c98