You should have seen an "opt-out" screen during the install.
If not simply uninstall Chrome.
Personally I prefer Chrome.
Just don't click, click, click your way through an install.
Nowadays it's a common practice to "piggy-back" software during an install.
edit: Using the custom install has nothing to do with the Chrome "opt-out" screen.
The "opt-out" screen is in all versions.