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Previously, the loader would unconditionally clear the request's
Content-Type header upon any redirect. This would cause the value to be
lost upon reloading a page that loaded through a HTTP/307 or HTTP/308
redirect that preserved the POST body.

Bug: 860546
Change-Id: Id5af5b03a997b8fa185af7ad3245cec5952b3b92
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363661Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Eric Lawrence [MSFT] <ericlaw@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#799854}