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I'm not really sure why this is happening as we only store strings in
the dictionary. However there have been a few crash reports.

Bug: 1136031
Change-Id: I105bc90e4897ac01d3db5550382ac8b38e566347
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2470633Reviewed-by: Richard Knoll <knollr@chromium.org>
Commit-Queue: Rayan Kanso <rayankans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816996}