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This updates ios.

Targets go from foo_features to foo_buildflags
And similarly the header now has buildflags in the name.

BUG=814485
TEST=covered by build

Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I7a59eb0e91b3813855e79352a6146f4d1410c85a
Reviewed-on: https://chromium-review.googlesource.com/981322Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545932}