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This is a reland of 02b24a76

Forgot to add the line in proguard.py to make VerifiesOnR work
correctly.

Original change's description:
> Move getPacProcessor() to GlueApiHelperForR
>
> Follow up after feedback on http://crrev.com/c/2328302.
>
> Bug: 1111909
> Change-Id: If3107a6bc513d2aad898e8bc87c8436392ee057d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2335385
> Commit-Queue: Clark DuVall <cduvall@chromium.org>
> Reviewed-by: Nate Fischer <ntfschr@chromium.org>
> Reviewed-by: Richard Coles <torne@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#794655}

TBR=torne@chromium.org

Bug: 1111909
Change-Id: I64eafe0fb9093907a5510142d73455aee3af2c67
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2337385
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Sam Maier <smaier@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794814}