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The template intent_definition requires intentbuilderc version
shipped with Xcode 11.4 or higher. Add a assertion failing at
`gn gen` time to avoid cryptic error at compilation time.

Bug: 1104769
Change-Id: I89b9a66ce8101138749bebd9f777e1e65ff3373a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2302637
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Jérôme Lebel <jlebel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789521}