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This CL adds a hack to blink that causes Lacros to user the Linux user
agent for netflix.com instead of the ChromeOS user agent. This allows
Lacros users to watch Netflix. A proper solution is blocked on the CDM
team, ETA Q2 2021.

Bug: 1114866
Change-Id: I8b510a9c0886d7f472d932416d60ad404093384c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2521140
Commit-Queue: Erik Chen <erikchen@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825088}