Stop associating Brave with the ftp protocol

[fmarier]

Chromium removed ftp support from the codebase in M91, but it is still included in the desktop shortcut on Linux and so it gets used when opening ftp URLs:

xdg-mime query default x-scheme-handler/ftp

Upstream meta-bug: https://bugs.chromium.org/p/chromium/issues/detail?id=333943

[fmarier]

I have filed a bug upstream for this: https://bugs.chromium.org/p/chromium/issues/detail?id=1210977

[fmarier]

Merged into M92: https://chromium.googlesource.com/chromium/src/+/a3ab59c808b58d126b6ca5fd588516c203ffa436

[btlechowski]

Added QA/Blocked till we get a release build.

[LaurenWags]

Removed QA/Blocked, release preview version is available: https://github.com/brave/brave-browser/releases/tag/v1.26.63

[btlechowski]

Verification passed on

Brave	1.26.63 Chromium: 91.0.4472.106 (Official Build) (64-bit)
Revision	574f7b38e4e7244c92c4675e902e8f8e3d299ea7-refs/branch-heads/4472@{#1477}
OS	Ubuntu 20 LTS

Verified that after Ubuntu 20 installation, Firefox is associated with the protocols:

Verified that after installing Brave 1.26.x (release channel) and restarting the system, Brave is not associated with the protocols

Verified that on existing Brave installations, after installing Brave 1.26.x (release channel), Brave is no longer associated with the protocols

[mowny]

This is also still a problem on windows.

Version 1.47.186 Chromium: 109.0.5414.119 (Offizieller Build) (64-Bit)

EDIT: Upstream issue: https://bugs.chromium.org/p/chromium/issues/detail?id=1211821