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This is mostly a code cleanup; it seemed weird that if you pass '--help'
to the script it would generate the manifest files before showing you
the command line!

Bug: None
Change-Id: I00515216c6883ee38d591993a59bf9d960163b8e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2412695Reviewed-by: Luke Z <lpz@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807558}