android: Remove unneeded md5sum class for jar.py and jar_toc.py.

Both actions have a small fixed list of inputs. md5sum is only needed for
variable input lists (see bug). No behavior change.

BUG=177552
R=cjhopman@chromium.org

Review URL: https://codereview.chromium.org/184103038

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255436 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255436