Add key for brave services

[jumde]

Description

Requests to brave services will use the brave services key

[kjozwiak]

@jumde assuming this should be labelled as QA/Yes as there's a test case outlined in brave/brave-core#3198 (comment)?

[jumde]

Updated the label @kjozwiak

[btlechowski]

Verified passed with

Brave	1.2.8 Chromium: 78.0.3904.108 (Official Build) dev (64-bit)
Revision	4b26898a39ee037623a72fcfb77279fce0e7d648-refs/branch-heads/3904@{#889}
OS	Ubuntu 18.04 LTS

Verified test plan from brave/brave-core#3198
Verified BraveServiceKey for following domains
https://static1.brave.com

https://crlsets.brave.com

https://crlsets.brave.com en-us-8-0.bdic - does not have BraveServiceKey

https://laptop-updates.brave.com - does not have it

https://static.brave.com

https://go-updater.brave.com

https://componentupdater.brave.com

https://brave-core-ext.s3.brave.com

https://p3a.brave.com

https://safebrowsing.brave.com

https://ads-serve.brave.com - does not have it

Logged #7062

Verification passed on

Brave	1.2.37 Chromium: 79.0.3945.88 (Official Build) beta (64-bit)
Revision	c2a58a36b9411c80829b4b154bfcab97e581f1f3-refs/branch-heads/3945@{#954}
OS	Windows 10 OS Version 1803 (Build 17134.1006)

• Verified the test plan from Issue 5690: Add key for brave services brave-core#3198
• Verified BraveServiceKey for following domains in a clean profile
  https://static1.brave.com
  

https://static.brave.com

https://crlsets.brave.com

https://go-updater.brave.com

https://componentupdater.brave.com

https://safebrowsing.brave.com

https://brave-core-ext.s3.brave.com

• Verified brave service requests will use BraveServiceKey in an upgraded profile

Verification PASSED on macOS 10.15.2 x64 using the following build:

Brave	1.2.40 Chromium: 79.0.3945.88 (Official Build) (64-bit)
Revision	c2a58a36b9411c80829b4b154bfcab97e581f1f3-refs/branch-heads/3945@{#954}
OS	macOS Version 10.15.2 (Build 19C57)
JavaScript	V8 7.9.317.32

https://static.brave.com

https://go-updater.brave.com

https://componentupdater.brave.com

https://brave-core-ext.s3.brave.com

https://static1.brave.com

https://safebrowsing.brave.com

https://p3a.brave.com

https://crlsets.brave.com