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This method is not used, and removing it is a nice clarification of
the use case of this interface.

TBR=jochen@chromium.org

Bug: 809927
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I2ff8915f93612f029172f4b6478b7ea9eb04b9e6
Reviewed-on: https://chromium-review.googlesource.com/1046847
Commit-Queue: Colin Blundell <blundell@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Roger Tawa <rogerta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561016}