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This was found by the new checker in blink_gc_plugin.

Bug: 522357
Change-Id: Iba582ffbe39c3f4311fae277c540999ae0350173
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2130271Reviewed-by: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755176}