Revert "Add allocator field to ClassLoader."

Times out on 32bit target/host for 132-daemon-locks-shutdown test.

Bug: 22720414

This reverts commit d36609b258f5c4b0a3d33adcfbf33af8124a06f6.

Change-Id: Ic085aaea954c2d722221b8767aa6ac7c93e8234b
1 file changed