rails/info causes frameworks that are not already loaded to be (partially?) loaded

For one particular project, running on Rails 2.3, we do not need ActiveRecord. In config/environment.rb, I have removed the ActiveRecord framework:

Rails::Initializer.run do |config|
  # [ ... ]
  # Skip frameworks you're not going to use. To use Rails without a database,
  # you must remove the Active Record framework.
  config.frameworks -= [ :active_record, :action_mailer ]
end

Unfortunately, a call to Rails::Info causes ActiveRecord to be defined, as you can see from this console session:

mathie@Tullibardine booger (master) $ script/console
Loading development environment (Rails 2.3.2)
Object.con>> Object.const_defined?("ActiveRecord")
=> false
>> Rails::Info
=> About your application's environment
Ruby version              1.8.6 (universal-darwin9.0)
RubyGems version          1.3.3
Rack version              1.0
Rails version             2.3.2
Active Record version     2.3.2
Action Pack version       2.3.2
Active Resource version   2.3.2
Action Mailer version     2.3.2
Active Support version    2.3.2
Application root          /Users/mathie/booger
Environment               development
>> Object.const_defined?("ActiveRecord")
=> true

This causes a problem because some parts of Rails, the generated skeleton application and several plugins check to see if ActiveRecord is defined to test for database support.

The plugin in particular, which both calls Rails::Info and checks for the existence of ActiveRecord in order to enable portions of itself, is New Relic's RPM Agent (which is why I'm about to point those guys at this report too!).

Attached is a patch without tests -- I'll attempt to work on tests just now, but I could always use the help. :-)