Revert^2 "Harmony: Change Mock build"

This reverts commit 76b5e70d.

Include the prepackaged harmony class file. There are no longer reasons
for embedding dex files as base64.

Partially reverts commit db3fb7d7.

Bug: 116674705
Test: mmma external/apache-harmony/jdwp
Test: m apache-harmony-jdwp-tests-hostdex vogar && art/tools/run-jdwp-tests.sh --mode=host
Change-Id: Iff70a513bc13b137948b2d9e0442c5128501c822