Generic refcode is not set for stub installer pings

[btlechowski]

Description

The stub installer is sending 3pings which contain the ref code.
The generic refcode implemented in #2547 is not used.

Steps to Reproduce

1. Unpack BraveUpdate.zip and copy to c:\
2. Uninstall Brave
3. Delete Brave profile
4. Delete c:\Program Files (x86)\BraveSoftware\
5. Delete C:\ProgramData\BraveSoftware\
6. Run stub installer
7. Check C:\ProgramData\BraveSoftware\Update\Log\BraveUpdate.log for the 3 pings

Actual result:

none is used instead of generic code.

[05/28/19 00:06:58.931][BraveBrowserBetaSetup v0.65.111][3428:11080][Send][url=https://laptop-updates.brave.com/1/installerEvent?platform=winx64-bc&version=0.0.0&channel=beta&ref=none&event=startup][request=][filename=]
[05/28/19 00:07:17.817][BraveUpdate:goopdate][4360:5852][Send][url=https://laptop-updates.brave.com/1/installerEvent?platform=winx64-bc&version=0.65.107&channel=beta&ref=none&event=download-complete][request=][filename=]
[05/28/19 00:07:18.733][BraveUpdate:goopdate][4360:5852][Send][url=https://laptop-updates.brave.com/1/installerEvent?platform=winx64-bc&version=0.65.107&channel=beta&ref=none&event=installer-run][request=][filename=]

Full log: BraveUpdate.log

Expected result:

Generic code BRV001 is used

Reproduces how often:

Easily reproduced

Brave version (brave://version info)

Brave	0.65.107 Chromium: 75.0.3770.38 (Official Build) beta (64-bit)
Revision	3860105745f2b12537da9e9f048f14c3f52ba970-refs/branch-heads/3770@{#618}
OS	Windows 10 OS Version 1803 (Build 17134.523)

cc @brave/legacy_qa
Not sure how important are those pings cc @emerick @rebron @davidtemkin

[emerick]

@aekeus Let me know if this needs to get in there, we would just need to update our Omaha client since it's affecting the stub installer.

[rebron]

cc: @mbacchi Can you take a look at this one?

[GeetaSarvadnya]

The issue is Reproducible on Brave beta 0.65.113.
BraveUpdate.log

[kjozwiak]

@rebron @aekeus @mbacchi any updates on this one? Is priority/P3 appropriate? I know we've been working hard making sure that the generic pings are working correctly so not 100% sure where this stands.