Previously, when the default action dialog opens, we get three errors. This is
because CommandUtil.getCommandEntry does not return an Entry instance and this CL fixes it.

BUG=none
TEST=manually

Review URL: https://codereview.chromium.org/26668003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228919 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228919