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This will prevent possible collisions, and ensures that files generated
by a target all live in that target's output.

Note that unpack_pak.py, previously used to create the folder of
preprocessed Web UI files, has an equivalent assert.

Bug: 1071641
Change-Id: Ic24e2a6c98cc35957c692bfa1a0d40fca1b7423e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424846
Auto-Submit: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809511}