ime: Fix a valgrind error in the chromeos bots.

BUG=none
TBR=komatsu@chromium.org

Review URL: https://codereview.chromium.org/107543002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239084 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239084