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This change updates the multi-account handling code to make sure the
options parameter object is present before dereferencing it to find
the "account" field. A new browser test calls getAuthToken without
options.

BUG=381637

Review URL: https://codereview.chromium.org/323563004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@275587 0039d316-1c4b-4281-b951-d872f2087c98