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Applications build for the macOS "catalyst" environment do not support
the extensions or widgets that ships with Chrome on iOS. Fix the build
when the variables used to enabled them are set to false.

Add assertion to ensure that the BUILD.gn defining the extensions and
widgets are not included when the variables are set to false, in order
to prevent from accidental inclusion.

Add a gn variable to control whether screen_time is enabled or not.
It will allow disabling it when environment is macOS "catalyst".

Bug: 1138425
Change-Id: If2cf9734c0595098cb2f60247702f73cf5da7d63
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2498593
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821287}