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This change modifies the CUPS IPP backend to suppress papers whose
vendor IDs are not meant for users' eyes - i.e. the "custom_min" and
"custom_max" sizes that CUPS incidentally exposes.

Bug: 1026938
Change-Id: I047844030e7f7a161bda32755754494567e7734c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1935173Reviewed-by: Sean Kau <skau@chromium.org>
Commit-Queue: Kalvin Lee <kdlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720578}