Revert "Pass -Xbootclasspath to device tests."

This reverts commit 69f7f1337495fd167423b004bb8ef4c214026e0a.

Reason for revert: While this approach helps BCP consistency
for libcore tests, this goes against other vogar on-device
testing. We shall deal with the libcore tests some other way.

Change-Id: Idd6ab191df9503144808c98cf12e9a6af19e78e7
Test: Rely on TreeHugger for clean revert.
Bug: 119868597
1 file changed