Remove ActionController::RaiseActionExceptions.

The latest modification to the code was done in https://github.com/rails/rails/commit/5e3517ea. In Rails 3.2,
`ActionController#rescue_action` was deprecated and `rescue_action_without_handler` is no longer being used.

actionpack/lib/action_controller/test_case.rb

@@ -456,7 +456,6 @@ module ActionController
         end
 
         def controller_class=(new_class)
-          prepare_controller_class(new_class) if new_class
           self._controller_class = new_class
         end
 
@@ -473,11 +472,6 @@ module ActionController
             Class === constant && constant < ActionController::Metal
           end
         end
-
-        def prepare_controller_class(new_class)
-          new_class.send :include, ActionController::TestCase::RaiseActionExceptions
-        end
-
       end
 
       # Simulate a GET request with the given parameters.
@@ -713,34 +707,6 @@ module ActionController
       end
     end
 
-    # When the request.remote_addr remains the default for testing, which is 0.0.0.0, the exception is simply raised inline
-    # (skipping the regular exception handling from rescue_action). If the request.remote_addr is anything else, the regular
-    # rescue_action process takes place. This means you can test your rescue_action code by setting remote_addr to something else
-    # than 0.0.0.0.
-    #
-    # The exception is stored in the exception accessor for further inspection.
-    module RaiseActionExceptions
-      def self.included(base) #:nodoc:
-        unless base.method_defined?(:exception) && base.method_defined?(:exception=)
-          base.class_eval do
-            attr_accessor :exception
-            protected :exception, :exception=
-          end
-        end
-      end
-
-      protected
-        def rescue_action_without_handler(e)
-          self.exception = e
-
-          if request.remote_addr == "0.0.0.0"
-            raise(e)
-          else
-            super(e)
-          end
-        end
-    end
-
     include Behavior
   end
 end