Fix 10269: Do not proxy downloads for Widevine (uplift to 1.10.x)

[brave-builds]

Uplift of #5846
Resolves brave/brave-browser#10269

Approved, please ensure that before merging:

• You have checked CI and the builds, lint, and tests all pass or are not related to your PR.
• You have tested your change on Nightly.
• The PR milestones match the branch they are landing to.

After you merge:

• The associated issue milestone is set to the smallest version that the changes is landed on.

[kjozwiak]

Looks like npm run audit_deps failed on every platform as per the following:

19:37:58  /home/ubuntu/workspace/pr-brave-browser-pr5846_widevine_download_exception_1.10.x: python /home/ubuntu/workspace/pr-brave-browser-pr5846_widevine_download_exception_1.10.x/src/brave/script/audit_deps.py
19:37:59  
19:37:59  Traceback (most recent call last):
19:37:59    File "/home/ubuntu/workspace/pr-brave-browser-pr5846_widevine_download_exception_1.10.x/src/brave/script/audit_deps.py", line 66, in <module>
19:37:59      sys.exit(main())
19:37:59    File "/home/ubuntu/workspace/pr-brave-browser-pr5846_widevine_download_exception_1.10.x/src/brave/script/audit_deps.py", line 15, in main
19:37:59      return audit_deps(args)
19:37:59    File "/home/ubuntu/workspace/pr-brave-browser-pr5846_widevine_download_exception_1.10.x/src/brave/script/audit_deps.py", line 35, in audit_deps
19:37:59      resolutions = result['actions'][0]['resolves']
19:37:59  IndexError: list index out of range

This is a known issue and is being looked investigated. However, it doesn't block uplift.

Also looks like test-browser failed on macOS as per https://ci.brave.com/job/pr-brave-browser-pr5846_widevine_download_exception_1.10.x/1/execution/node/589/log/:

20:34:22  [  FAILED  ] BraveRewardsBrowserTest.NotVerifiedWallet, where TypeParam =  and GetParam() =  (6236 ms)
20:34:22  [567/567] BraveRewardsBrowserTest.NotVerifiedWallet (6346 ms)
20:34:22  1 test failed:
20:34:22      BraveRewardsBrowserTest.NotVerifiedWallet (../../brave/components/brave_rewards/browser/rewards_service_browsertest.cc:2433)

However, the above failure is known and was fixed via brave/brave-browser#9339 which is currently in 1.11.x.

[kjozwiak]

Uplift into 1.10.x approved after deliberating with @brave/uplift-approvers. QA also verified the issue on Nightly as per #5846 (comment).