Linux doesn't list Widevine component module in brave://components

[srirambv]

Description

Linux doesn't list Widevine component module in brave://components

Steps to Reproduce

1. Install latest dev version
2. Login to Netflix
3. Click Allow on both prompts to instal, run and restart browser
4. Play any video on Netflix after restart
5. Open brave://components, Widvine component is not listed

Actual result:

Expected result:

Should list it similar to Windows/macOS

Reproduces how often:

Easy

Brave version (brave://version info)

Brave	0.64.30 Chromium: 73.0.3683.75 (Official Build) dev(64-bit)
Revision	909ee014fcea6828f9a610e6716145bc0b3ebf4a-refs/branch-heads/3683@{#803}
OS	Linux

Reproducible on current release:

• Does it reproduce on brave-browser dev/beta builds?
  Yes

Website problems only:

• Does the issue resolve itself when disabling Brave Shields?
  N/A
• Is the issue reproducible on the latest version of Chrome?
  N/A

Additional Information

cc: @simonhong

[btlechowski]

Verification passed on

Brave	1.20.86 Chromium: 88.0.4324.96 (Official Build) dev (64-bit)
Revision	68dba2d8a0b149a1d3afac56fa74648032bcf46b-refs/branch-heads/4324@{#1784}
OS	Ubuntu 18.04 LTS

Verified test plan from the description. Verified Verified widevine is available from brave://components after widevine installation

Verified test plan from brave/brave-core#7228
Test with clean profile
Verified widevine is not available from brave://components on clean profile

Verified widevine is available from brave://components after installation

Verified able to watch netflix:

Test with old profile(widevine enabled)
Verified widevine is available from brave://components and it's version is 4.10.1610.0

Verified able to watch netflix:

[LaurenWags]

Changed to release-notes/exclude as this is covered under #7081 which will be included in 1.20.x release notes