removed String.mb_chars upcase and downcase methods for Ruby 1.9

Rails 3.0.0 already includes Unicode aware upcase and downcase methods for Ruby 1.9

lib/active_record/connection_adapters/oracle_enhanced_core_ext.rb

@@ -22,44 +22,3 @@ def to_d #:nodoc:
     end
   end
 end
-
-# Add Unicode aware String#upcase and String#downcase methods when mb_chars method is called
-if defined?(RUBY_ENGINE) && RUBY_ENGINE == 'ruby' && RUBY_VERSION >= '1.9'
-  begin
-    require "unicode_utils/upcase"
-    require "unicode_utils/downcase"
-
-    module ActiveRecord #:nodoc:
-      module ConnectionAdapters #:nodoc:
-        module OracleEnhancedUnicodeString #:nodoc:
-          def upcase #:nodoc:
-            UnicodeUtils.upcase(self)
-          end
-
-          def downcase #:nodoc:
-            UnicodeUtils.downcase(self)
-          end
-        end
-      end
-    end
-
-    class String #:nodoc:
-      def mb_chars #:nodoc:
-        self.extend(ActiveRecord::ConnectionAdapters::OracleEnhancedUnicodeString)
-        self
-      end
-    end
-
-  rescue LoadError
-    warning_message = "WARNING: Please install unicode_utils gem to support Unicode aware upcase and downcase for String#mb_chars"
-    if defined?(Rails.logger) && Rails.logger
-      Rails.logger.warn warning_message
-    elsif defined?(RAILS_DEFAULT_LOGGER) && RAILS_DEFAULT_LOGGER
-      RAILS_DEFAULT_LOGGER.warn warning_message
-    else
-      STDERR.puts warning_message
-    end
-  end
-
-
-end