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These changes simplify migrating to starlark by removing spurious diffs
from the semantic diff.

The repo_url, refs and header_id fields have no effect when
builder_view_only is true because builder views do not display headers
and do not display a list of changes being tested.

lucicfg enforces referential consistency, so a couple of non-existent
builders were removed. It also prevents a builder from being duplicated
in a builder view, so there was one repeated builder removed from
tryserver.chromium.mac console.

Bug: 1011908
Change-Id: Iec1ee893e27b6c4edec3ab546ab9485453cacede
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1851911
Commit-Queue: Garrett Beaty <gbeaty@chromium.org>
Reviewed-by: Aaron Gable <agable@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707072}