I too can confirm that extensions are broken in chromium. Many users rely on extensions to perform basic tasks on a day to day basis. For me, the lost of extensions is much more than a minor severity issue.
Please remove the whacky extension-blocking patches until this policy can be reassessed. It's fine if you want to disable them by default, but right now there is absolutely no way to work around this without rebuilding chromium (which is unacceptable). tim