Parsing of search ad from the page fails on 1.49.x

[btlechowski]

Not reproducible on 1.50.x

Steps to Reproduce

1. Run Brave using (fucntionality is behind a flag):

--enable-logging=stderr --vmodule="*/variations/*"=6,"*/bat-native-ledger/*"=6,"*/brave_rewards/*"=6,"*/bat-native-ads/*"=6,"*bat-native-confirmations/*"=6,"*/brave_ads/*"=9,"*/brave_user_model/*"=6,"*/bat_ads/*"=6 --enable-features=SupportBraveSearchResultAdConfirmationEvents

2. Enable rewards and ads
3. Trigger a search ad

Actual result:

Search ad was not parsed:

[5483:5483:0221/132910.968632:VERBOSE6:search_result_ad_converting_util.cc(239)] Some of search result ad attributes were not specified: data-conversion-advertiser-public-key-value, data-conversion-observation-window-value, data-conversion-type-value, data-conversion-url-pattern-value

Expected result:

Search ad was parsed:

[5146:5146:0221/132149.606688:VERBOSE6:search_result_ad_converting_util.cc(308)] A search result ad was delivered:
  "data-placement-id": 8307b888-cbe2-4ac8-ad98-4b8c92578094
  "data-creative-instance-id": dee04019-f32c-478e-9a9d-1861032bd268
  "data-creative-set-id": d3bb88f0-0814-4c8f-aebb-8eddc0604469
  "data-campaign-id": 5f8595c6-d25f-4786-aaa2-ce380ea8c6b5
  "data-advertiser-id": 735a260f-45d5-4b29-b2f0-9918e910f0ae
  "data-landing-page": https://med.etoro.com/aw.aspx?B=20017&A=84346&Task=Click&SubAffiliateID=352042739
  "data-headline-text": eToro™ - Multiple Asset Broker
  "data-description": Discover Opportunities in Local & Global Markets. Capital at risk. See PDS and TMD
  "data-rewards-value": 0

Reproduces how often:

Brave version (brave://version info)

Brave	1.49.106 Chromium: 110.0.5481.104 (Official Build) beta (64-bit)
Revision	46de4a7f41979e829b430bc1ee30ef483aa227ac-refs/branch-heads/5481_77@{#19}
OS	Linux

Version/Channel Information:

• Can you reproduce this issue with the current release? NA
• Can you reproduce this issue with the beta channel? yes
• Can you reproduce this issue with the nightly channel? no

[tmancey]

Closing as fix was not uplifted. Thanks