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When enable_jdk_library_desugaring=true, this change allows shrinking of
the generated "j$" dex from ~400 KB to 36 KB.

ConcurrentHashMap is available before before Java 8 but with a bug:
crbug.com/905903

Bug: 1056751
Change-Id: Ibaaeba2f714c0e8b17295cbe48098786ad173448
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2446989Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Ian Wells <iwells@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814363}