Ungoogled-chromium: Change chrome://version branding

[k2l8m11n2]

Is your feature request related to a problem? Please describe.
Right now chrome://version says (Official Build), that's kind of confusing.

Describe the solution you'd like
Change it to something like (Ungoogled Build).

[Eloston]

Official Build has a special meaning for Chromium builds, so I want to preserve that.

I don't want to change the branding of the browser, but perhaps we could insert a string like (ungoogled-chromium) to indicate that this is an ungoogled-chromium build.

[k2l8m11n2]

This is what it looks in a version I found for Fedora. (What's the difference between an Official Build and a Developer Build BTW?)

[ghost]

It's related to the gn flag is_official_build:

# Set to enable the official build level of optimization. This has nothing
# to do with branding, but enables an additional level of optimization above
# release (!is_debug). This might be better expressed as a tri-state
# (debug, release, official) but for historical reasons there are two
# separate flags.
is_official_build = false

👉 https://chromium.googlesource.com/chromium/src/+/72.0.3626.96/build/config/BUILDCONFIG.gn#125

[TCB13]

@k2l8m11n2 you can always edit build/src/chrome/browser/resources/settings/about_page/about_page.html to add something after the current message:
````

$i18n{aboutBrowserVersion} [happy ungoogled-chromium build!]

````