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This reverts commit 3893c26b.

Reason for revert: Dangling reference to ios-simulator-xcode-clang.json.

https://sheriff-o-matic.appspot.com/chromium/examine/chromium.read%20build%20config

Original change's description:
> [iOS] Remove xcode clang bots
> 
> Bug: 1049646
> Change-Id: If024c2185409167031bcdaf3a801e73cb1c61b0b
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2042679
> Reviewed-by: Justin Cohen <justincohen@chromium.org>
> Reviewed-by: Stephen Martinis <martiniss@chromium.org>
> Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#741519}

TBR=justincohen@chromium.org,martiniss@chromium.org,michaeldo@chromium.org

Change-Id: I2e0e630a1c4f5ed5706a40a34a5c479e1dff31f1
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1049646
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2057583Reviewed-by: Chris Mumford <cmumford@google.com>
Commit-Queue: Chris Mumford <cmumford@google.com>
Cr-Commit-Position: refs/heads/master@{#741528}