The first reg entry I would suggest is in relation to your saying no to Chrome on the install, so that you don't get offered it again.
The others I have no idea why they are there, I have them too, but I don't use any google products/clients. However, I have customised my google search settings. I also tried google Chrome a couple of times previously, but uninstalled it.
I also have HKEY_LOCAL_MACHINE\SOFTWARE\Google\NavClient which is effectively empty (name=Default, Type=REG_SZ Data=(value not set).