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Rather than whatever version of java is available in PATH.

For desugar and errorprone, some java warnings started to show
up from this:
"WARNING: An illegal reflective access operation has occurred"

I've just silenced them with a stderr filter, and figure they
will go away next time we roll these deps.

I've checked the effect on d8 & r8 for this:
 * On my local machine, they run much faster.
 * On the trybot, they ran a bit slower.

Bug: 693079
Change-Id: I4001bbcb5bdcc2a9afa062c35633dc397b0ef9cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1857702
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706483}