This is really, really bad ...
Edit: Ok, almost all of us. There are some non-Google browsers such as firefox, but Google dished out money to Mozilla for many years, which made real competition impossible.
People choose to download Chrome over firefox, to ditch their custom browser engine (microsoft & opera) in favor of chromium.
We've centralized development effort on a large open source project.
Why exactly is this really really bad?
I find the safari situation bad because I can't use various web standards, it's closed source, etc, but the chromium one doesn't bother me. I just install firefox.