Extension manifest.json homepage_url should default to Chrome Web Store URL

[ccampbell]

Description

In Chrome, if an extension does not specify the homepage_url field in the manifest.json, it defaults to the Chrome Web Store URL so right clicking the extension icon allows you to quickly navigate to it.

From the documentation:

If you distribute your extension using the Chrome Web Store, the homepage URL defaults to the extension's own page.

Steps to Reproduce

1. Install this extension (shameless self-promotion): https://chrome.google.com/webstore/detail/xtab/amddgdnlkmohapieeekfknakgdnpbleb
2. Right click the extension icon

Actual result:

Notice that the link to the item is grayed out:

Expected result:

It should be clickable (in Chrome):

Reproduces how often:

Every time

Brave version (brave://version info)

Key	Value
Brave	0.61.52 Chromium: 73.0.3683.86 (Official Build) (64-bit)
Revision	f9b0bec6063ea50ce2b71f5b9abbae7beee319a6-refs/branch-heads/3683@{#858}
OS	Mac OS X

Reproducible on current release:

Unsure

Website problems only:

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

Additional Information

This is tangentially related to #3248