Fix use after free due to https://codereview.chromium.org/84743003/

BUG=None
TEST=CrOS Asan bots get greener
R=sadrul@chromium.org, sadrul
TBR=oshima

Review URL: https://codereview.chromium.org/100863004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239421 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239421