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For compatibility, make all callbacks return false when is_main_frame is
false (current behavior).

Bug: 823285
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I0bd4c7d1561df87f80c88b37e2342e4589a1fd24
Reviewed-on: https://chromium-review.googlesource.com/1105989Reviewed-by: John Wu <jzw@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569236}