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These defaults are misleading, since those of them that were different
from 'false' were ignored everywhere.
According to code search, the code in Chrome and ChromeOs always looks
like:

if (proto.has_PROPERTY()) {
  ... = proto.PROPERTY();
}

or

if (!proto.has_PROPERTY()) {
  return;
}
... = proto.PROPERTY();

Bug: b:168328072
Bug: 1058092
Change-Id: I2b68ddf4316b3fb10ccccb749cbd4cb915df641a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2418989Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Commit-Queue: Leonid Baraz <lbaraz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808589}