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These two bots run iOS tests. ios-simulator is CQ bot.
ios-simulator-full-configs is main waterfall bot. Expand the swarming pool
size for it.

Bug: 795980
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Iad52add5c29c24a212ec69c8918dd8f809086e39
Reviewed-on: https://chromium-review.googlesource.com/961726Reviewed-by: Sergey Berezin <sergeyberezin@chromium.org>
Commit-Queue: Menglu Huang <huangml@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543200}