Do not try to resolve realpath in DexManager.

PM should already provide the real path of the application directory.

Test: runtest -x .../DexManagerTests.java

Bug: 33807524
Bug: 32871170

(cherry picked from commit c066205c)

Change-Id: Ie6b5f5e61d08710e7ef7d3149b7b13cc7d03a242