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The app crashes if the method is called after |_webState| is deallocated.

Change-Id: I8c06cddc8ea3a39fd2c8c5d05d4c17fa0bd071d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1830251Reviewed-by: John Wu <jzw@chromium.org>
Commit-Queue: Hiroshi Ichikawa <ichikawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701017}