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Some code paths require access to Blink strings that can only be
 accessed on the main thread.
A test that triggers the bug is coming up on crrev.com/c/738040.

Bug: 791992
Change-Id: I55ae617ae623766d4bd975a19070bde410d8af1d
Reviewed-on: https://chromium-review.googlesource.com/809005Reviewed-by: Henrik Boström <hbos@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521708}