[GWP-ASan] Remove unnecessary test isolation.

With Kostya's new fix in aosp/1518898, we no longer need to run the
gtests in isolation to fix the late-init sequence.

Bug: N/A
Test: atest gwp_asan_unittest --rerun-until-failure 100
Test: Summary
Test: -------
Test: RERUN_UNTIL_FAILURE 100
Test: arm64-v8a gwp_asan_unittest: Passed: 53, Failed: 0, Ignored: 0,
Test: Assumption Failed: 0

Change-Id: Ib116024f7ec8a5d739ce64328746c2d27d520357
1 file changed