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As the bug is fixed, enable ResultDB in all iOS builders. This change
reverts crrev/c/2465924, crrev/c/2536932, crrev/c/2551288.

Bug: 1136998
Change-Id: I7cd8f397a51f5d041b932598ead014c3bdc654e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2558787Reviewed-by: Chan Li <chanli@chromium.org>
Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Commit-Queue: Zhaoyang Li <zhaoyangli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830852}