US country code incorrectly stripped from P3A reports

Description

In #21460 I inadvertently stripped the US country code from P3A report metadata. This is an important region with many users, so stripping it harms our understanding of browser use without improving user privacy.

US should be added to the list of generally-accepted country codes for reporting.

Steps to Reproduce

1. Install with US locale
2. Observe P3A report metadata

Actual result:

Country code is other

Expected result:

Country code should be US.

Reproduces how often:

Always

Desktop Brave version:

1.38.28

Android Device details:

• Install type (ARM, x86):
• Device type (Phone, Tablet, Phablet):
• Android version:

Version/Channel Information:

• Can you reproduce this issue with the current release? N/A
• Can you reproduce this issue with the beta channel? N/A
• Can you reproduce this issue with the nightly channel?

Other Additional Information:

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

Miscellaneous Information:

[Uni-verse]

Verified using 1.38.104, Chromium 101.0.4951.41 on Samsung Galaxy S21 running Android 12

• Confirmed country_code: us is being appended to the request
• Confirmed that “country_code” is “US” in JSON message

1	2

[rillian]

@GeetaSarvadnya, the country code sent with P3A message is derived from the timezone rather than the locale. So if you set the system timezone to US/Eastern, America/New York, or similar you should see the expected US country code in P3A reports, independent of the configured language or other locale settings.