Removed is_immediate_model? - not used, not completely accurate

lib/brakeman/checks/base_check.rb

@@ -305,10 +305,6 @@ class Brakeman::BaseCheck < Brakeman::SexpProcessor
     end
   end
 
-  def is_immediate_model? exp, out = nil
-    exp == has_immediate_model?(exp, out)
-  end
-
   #Checks for a model attribute at the top level of the
   #expression.
   def has_immediate_model? exp, out = nil