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It was only being used on iOS, but the system handles
wkWebView-initiated data URL requests there, and they aren't needed for
internal requests, so this CL also removes all of iOS's uses of the
class.

I'll remove DataProtocolHander and URLRequestDataJob in followup CLs
that make sure we don't lose test coverage of the data URL parsing code,
which is still in use.

Change-Id: I5e6789b36c457a7ab06f7a8e0c1cf1dcee2929b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1868837
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Eric Roman <eroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707574}