GitLab

Currently there are no widevine cdm libraries for arm64 builds.
Disable it to avoid build errors when building ARM64 Chrome
in Chrome OS.

Bug: 881022
Test: No more missing widevinecdm files errors.
Change-Id: I476415cef0c435cb50e113de4e576cb6d3006951
Reviewed-on: https://chromium-review.googlesource.com/1211974Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Commit-Queue: Manoj Gupta <manojgupta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589983}