Default Variation on Windows and Android

[jonathansampson]

Description

Field Trials are, AFAIK, disabled in Brave. That said, Brave on Windows and Android still enumerate a single variation when you visit about:version. This variation appears to be a fallback sampling trial, as found here:

// Create a field trial to control metrics/crash sampling for Stable on
// Windows/Android if no variations seed was applied.
void CreateFallbackSamplingTrialIfNeeded(base::FeatureList* feature_list) {
#if defined(OS_WIN) || defined(OS_ANDROID)
    ChromeMetricsServicesManagerClient::CreateFallbackSamplingTrial(
        chrome::GetChannel(), feature_list);
#endif  // defined(OS_WIN) || defined(OS_ANDROID)
}

Steps to Reproduce

1. Visit about:version
2. Note variations

Actual result:

5e3a236d-4113a79e is present in the Stable release:
5e3a236d-59e286d0 is present in all other builds:

Expected result:

Unsure, but our options are:

1. Variation should be removed
2. macOS should be included
3. We do nothing, and leave as-is

Brave version (brave://version info)

Version/Channel Information:

• Can you reproduce this issue with the current release? Yes
• Can you reproduce this issue with the beta channel? Yes
• Can you reproduce this issue with the dev channel? Yes
• Can you reproduce this issue with the nightly channel? Yes

Other Additional Information:

• Is the issue reproducible on the latest version of Chrome? Yes

[bsclifton]

cc: @bridiver @SergeyZhukovsky

[srirambv]

@bsclifton probably good to have 2 issues one for desktop and one for Android if there needs to be QA done for this

[jumde]

@bsclifton @bbondy - Android build is in progress, will try to wrap this up today.