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chrome://historytedchoc@chromium.org authored
$('alertOverlay') is null so the call for classList failed. Guard the condition to see if the element exists. BUG=379194 Review URL: https://codereview.chromium.org/301223009 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@273956 0039d316-1c4b-4281-b951-d872f2087c98
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