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This CL supports running the code coverage tool on iOS platform and
removes the ios/tools/coverage.

Bug: 814608

Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I135c9505a7f2aadc9cd71ca5f6b3893776aed116
Reviewed-on: https://chromium-review.googlesource.com/935195
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Abhishek Arya <inferno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539940}