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Chromium compiles with the 10.14 SDK, so remove old code that handled
the case where it compiled with previous SDKs.

Also update property accesses to use property syntax.

Bug: 1044838
Change-Id: Ib7f2e5cd2cfc436dd815e5861d0448262f43955c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2021024
Auto-Submit: Avi Drissman <avi@chromium.org>
Commit-Queue: Brandon Jones <bajones@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737896}