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SDCH has been disabled in Chrome since M59. For more details please see
Issue 690070 and blink-dev@ thread linked below.

This CL is to remove sdch code from net/url_request.
This is the first CL in the series.

Bug: 762686
Change-Id: If467b19a2b963c3790bf372ab278bbf847052ddf
Reviewed-on: https://chromium-review.googlesource.com/660999Reviewed-by: Randy Smith <rdsmith@chromium.org>
Commit-Queue: Helen Li <xunjieli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501339}