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Define is_lacros GN variable as an alias for chromeos_is_browser_only.

In the future we plan to move to is_lacros and is_ash both derived from
GN variable chromeos_product. However we want to introduce the is_lacros
variable before that so that developers can start using it now.

For more detail please read the design doc go/lacros-build-config.

Test: None
Bug: 1052397
Change-Id: I33d6555ccd1ec4d7a08a659eab25c3709887e63b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2444876
Commit-Queue: Yuta Hijikata <ythjkt@chromium.org>
Auto-Submit: Yuta Hijikata <ythjkt@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813331}