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We want to get rid of the single argument AddHeader() method as the two
argument AddHeader() and SetHeader() methods are safer and more flexible.

Bug: 1068194
Change-Id: Id41cbb7a1ced299610f60a4a0be691fdebf8b044
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2148026
Auto-Submit: Matt Menke <mmenke@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760096}