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The class is moved to a helper file so it can be reused in tests for
sync invalidations.

Bug: 1135167
Change-Id: I30cbc76cd5ed032666c5827b007c94128a65ebb7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2450269
Commit-Queue: Paula Vidas <paulavidas@google.com>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Rushan Suleymanov <rushans@google.com>
Cr-Commit-Position: refs/heads/master@{#814150}