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On some platforms, the OOM path calls free(), which deadlocks as a
consequence, since we are holding the lock from this path.

Release it before OOM.

Bug: 998048
Change-Id: I6aec2b8aa7e4ce64f2b9754284ec8c42ee2bdc2c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2410872Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Benoit L <lizeb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807371}