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This optional method is not implemented by native content classes.

Bug: 725239
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I70bb3e0e308762bd90c354769eccd1cc2616ed73
Reviewed-on: https://chromium-review.googlesource.com/1073676Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#562024}