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Removes all the remaining uses of //third_party/pymock from the
following directories in favor of the version provided by vpython:

//chrome/installer/mac/signing/
//chrome/test/data/android/
//components/schema_org/

This is so that the third_party version can be removed.

Bug: 1094489
Change-Id: I3441c03b4af871dc3a7c0071f02c367a8839991a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2284045Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786030}