GitLab

Revert commit a62756b1 and reland
3294249d with fix.

Original CL description:

- DIR_COMPONENT_WIDEVINE_CDM is not used anymore.
- Update WidevineCdmComponentInstallerPolicy::GetRelativeInstallDir()
  to use kWidevineCdmBaseDirectory instead of hardcoded string.

TBR=waffles@chromium.org,thestig@chromium.org

Change-Id: I802a9575076e4f93e9ac302d40197117108de4d6
Reviewed-on: https://chromium-review.googlesource.com/791934Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519464}