Revert 239764 "Reland r239460: Remove usage of PathUtil from Com..."

> Reland r239460: Remove usage of PathUtil from CommandHandler.
> 
> r239460 was reverted to revert r239458, which was not reverted eventually.
> May be r239458 was not a cause of Chromium OS ASAN failure.
> 
> Previously reverted CL: crrev.com/96433003
> 
> BUG=302090
> TEST=manually
> 
> Review URL: https://codereview.chromium.org/107933003

TBR=hirono@chromium.org

Review URL: https://codereview.chromium.org/112373002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239987 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239987