In some tests the component updater singleton might be called first from the IO thread which is not expected.

This is observed today.

BUG=none
TBR=jam

Review URL: https://codereview.chromium.org/56743002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232551 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232551