Revert "Pin apache-harmony-tests to Java 1.7 / v52"

Commit 1ab6e78b23a8cc063c29e67a1d69f487baa1f0dc makes this unnecessary.

Bug: 27637680

This reverts commit 10cafe2a1bde4278d78c7c44ac118101d9d7f5fb.
(cherry picked from 973cf9e2189ea170b883890bea899172bdbc7212)

Change-Id: I259166ee2594fbb73bdfa67a389ec2b009bd8c43
1 file changed