GitLab

This reverts commit a06a6eb7.

Reason for revert: Seems to break non-goma builds on macos.

Original change's description:
> [ios] Always use symbolic links to system Xcode in build_root_dir
>
> Goma RBE only supports paths that are relative to the source dir
> while build not using Goma or using old Goma backend supports both
> so always use symbolic link to system Xcode on iOS.
>
> This fix the compilation for people using Goma as Goma RBE is now
> the default backend and without this change, the build would fall
> back to local compilation, drastically slowing the build.
>
> Stop using the ios_enable_relative_sdk_path and ios_use_goma_rbe
> gn variables as they are now always expected to be `true`. Keep
> the variable ios_use_goma_rbe to avoid breaking the bots that do
> override the value but ignore it (bot set it to true anyway).
>
> Bug: none
> Change-Id: I2a3c098304594fb20491ab92100e9a4101a048db
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2555117
> Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
> Reviewed-by: Nico Weber <thakis@chromium.org>
> Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#830616}

TBR=thakis@chromium.org,sdefresne@chromium.org

Change-Id: I5aed7d701a1d2d04d389cb4d746bc975e80b0f0f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: none
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2561019Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831019}