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The welcome screen is no longer used. Slay the zombie code.

Bug: 1002590
Change-Id: I0ef7c5e6df668ee3fa383b466ff90fe7c85401cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1797803
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Auto-Submit: Nina Satragno <nsatragno@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#695687}