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The existing errors are using protected visibility when they could be
using package-private visibility.

Bug: 1029038
Change-Id: Iec1da0fed876d2d2abc68414bdb7175aab02db95
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2602890Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Sam Maier <smaier@chromium.org>
Auto-Submit: Sam Maier <smaier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841085}