Add a temporary DumpWithoutCrashing for when an invalid header key is
set. This is to debug crbug.com/1028189 where a header key fails to
deserialize correctly.
Bug: 1028189
Change-Id: I8848f1b4b78363b56babd787d73f24f8c11dec3c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2401278
Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805369}