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Fixes ICU flush and pivot buffer causing fuzzing error.

BUILD.gn updated to not set WIN32_LEAN_AND_MEAN which is
defined in libxml.

Bug: 722420
Change-Id: Ib4ff2f870f99fb78e02f9841e33f6ad7e72e059e
Reviewed-on: https://chromium-review.googlesource.com/759919
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Reviewed-by: Scott Graham <scottmg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515451}