promoCode is never claimed after closing browser just after install

[btlechowski]

Steps to Reproduce

1. (Important) Uninstall Brave Browser with User Data to have a Clean install
   
2. (On Windows )Download stub/mini installer and rename it to BraveBrowserSetup-KAM253.exe
3. Run the stub/mini installer
4. Close Brave as soon as it is started
5. Run Brave and wait for promoCode to disappear
6. Check Local State file for promo_code

Note: promoCode and Local State files are located in AppData\Local\BraveSoftware\Brave-Browser\User Data\ on Windows

Actual result:

promoCode is never claimed
promo_code is not added to Local State

Expected result:

promoCode is claimed
promo_code is added to Local State

Reproduces how often:

always

Brave version (brave://version info)

Brave	0.55.20 Chromium: 70.0.3538.67 (Official Build) (64-bit)
Revision	9ab0cfab84ded083718d3a4ff830726efd38869f-refs/branch-heads/3538@{#1002}
OS	Windows 7 x64

@kjozwiak Can you check on Mac?
cc @srirambv @LaurenWags @GeetaSarvadnya @emerick

[emerick]

This is because we only look for the promoCode file on "first run". We should probably just look for it as long as we don't have a download_id in our local state, though.

[GeetaSarvadnya]

Verification Passed on

Brave	0.55.21 Chromium: 70.0.3538.77 (Official Build) (64-bit)
Revision	0f6ce0b0cd63a12cb4eccea3637b1bc9a29148d9-refs/branch-heads/3538@{#1039}
OS	Windows