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The extensions build for Chrome on iOS uses features that are not
supported in "catalyst" environment, so disable them when the app
is build for that environment.

Bug: 1138425
Change-Id: I160ad6b0288f27601d696f8b09fdfe3a3b8e68ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2497453
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Mike Pinkerton <pinkerton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821751}