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This change is pretty simple because there are no uses of these APIs
and only two overrides of deprecated methods:

* BridgedContentView now supports accessibilityChildren directly
* NativeWidgetMacNSWindow now supports accessibilityTitle directly

In informal testing, browser windows and controls seem to still be
navigable using VoiceOver.

Bug: 386671
Change-Id: I46593b863603a4c2155cfd19859ea09401182c1a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1528470
Auto-Submit: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#641679}