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Previously, the check failed if the default value was set to None
explicitly. This CL changes the check to fail only if the default value
is not set.

Change-Id: I2eb179f306e340b73e24a08f9bfe63bc07706b3d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533288
Commit-Queue: Julian Pastarmov <pastarmovj@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Reviewed-by: Chris Sharp <csharp@chromium.org>
Auto-Submit: Tibor Goldschwendt <tiborg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826742}