Do not leak flows from GetAuthTokenFunctionTest.InteractiveApprovalOAuthErrors.

BUG=313749

Review URL: https://codereview.chromium.org/77443002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236245 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 236245