Web Store Update URL Missing, causing source-attribution confusion

Description

Extensions installed from the Chrome Web Store are claiming to be not from the web store. This includes extensions like Google Translate and more, which clearly are from the Chrome Web Store.

Steps to Reproduce

1. Install Google Translate
2. Navigate to brave://extensions/
3. Note state of extension

Actual result:

The extension is not properly identified as having originated from the Web Store.

Reproduces how often:

Always.

Brave version (brave://version info)

1.32.84, 1.32.85, 1.33.37

Version/Channel Information:

• Can you reproduce this issue with the current release? No
• Can you reproduce this issue with the beta channel? Yes
• Can you reproduce this issue with the nightly channel? Yes

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? No
• Does the issue resolve itself when disabling Brave Rewards? No
• Is the issue reproducible on the latest version of Chrome? No

Miscellaneous Information:

https://github.com/brave/brave-core/blob/9929ff6411a14350dd61fd19a37e93726b44e64d/common/extensions/brave_extensions_client.cc#L47 assumes a kComponentUpdater switch, never falling back on extension_urls::GetDefaultWebstoreUpdateUrl() in its absence.

[kjozwiak]

Clearing the QA Pass labels. We should re-check this once we get an RC.

[jonathansampson]

@JimBreton Apologies; we’re working on getting this uplifted and delivered.