Remove suppression of race:browser_sync::PasswordChangeProcessor::Disconnect.

r224953 fixes it.

BUG=296862
NOTRY=true

Review URL: https://codereview.chromium.org/24465003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225307 0039d316-1c4b-4281-b951-d872f2087c98