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While //net's header parser will reject strings with embedded NULs,
HttpCHttpContentDisposition can be invoked directly on some arbitrary
string. It should handle NULs gracefully in this case.

Bug: None
Change-Id: I31b7a89d27ebc01d8311d5fde156672d974543e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1857520Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Asanka Herath <asanka@chromium.org>
Auto-Submit: Asanka Herath <asanka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705556}