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If we rebase the path, gn seems to confuse to set paths from current
working directory to have chrome/ios directory.
However, it should not have that.
Since XCRun path won't be sent to Goma, we do not need to normalize
that here.

Bug: 1015730
Change-Id: If175706ae564cbf124c53f0e0e1255b439cea682
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2022046
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Auto-Submit: Yoshisato Yanagisawa <yyanagisawa@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735812}