Revert "Android: Parallelize Error Prone"

This reverts commit 3cc62d6500b11c4ac271832766140fc9000e0331.

Reason for revert: Our bots don't have a consistent javac version

Original change's description:
> Android: Parallelize Error Prone
>
> Run two compile_java steps in parallel, one without errorprone (~20s) to
> unblock subsequent build steps (desugar, bytecode rewriting, dexing),
> and one with errorprone (if enabled) to check the build (~40s).
>
> This saves approximately 19 seconds for the overall incremental build of
> chrome_java.
>
> Bug: 906803
> Change-Id: I4dee29c246bbc65791088dcc5e38d1030310c466
> Reviewed-on: https://chromium-review.googlesource.com/c/1346992
> Commit-Queue: Peter Wen <wnwen@chromium.org>
> Reviewed-by: agrieve <agrieve@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#610477}

Bug: 906803, 693079, 921422
Change-Id: I3a09313563dd702c6fff4f351602d6f80bbf883e
Reviewed-on: https://chromium-review.googlesource.com/c/1412273
Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Commit-Queue: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#622934}
2 files changed