Remove observers and sweepers

They was extracted from a plugin.

See https://github.com/rails/rails-observers

[Rafael Mendonça França + Steve Klabnik]

actionpack/lib/action_controller/caching.rb

@@ -6,10 +6,10 @@ module ActionController
   # \Caching is a cheap way of speeding up slow applications by keeping the result of
   # calculations, renderings, and database calls around for subsequent requests.
   #
-  # You can read more about each approach and the sweeping assistance by clicking the
+  # You can read more about each approach and the by clicking the
   # modules below.
   #
-  # Note: To turn off all caching and sweeping, set
+  # Note: To turn off all caching, set
   #   config.action_controller.perform_caching = false.
   #
   # == \Caching stores
@@ -30,8 +30,6 @@ module Caching
 
     eager_autoload do
       autoload :Fragments
-      autoload :Sweeper, 'action_controller/caching/sweeping'
-      autoload :Sweeping, 'action_controller/caching/sweeping'
     end
 
     module ConfigMethods
@@ -54,7 +52,6 @@ def cache_configured?
 
     include ConfigMethods
     include Fragments
-    include Sweeping if defined?(ActiveRecord)
 
     included do
       extend ConfigMethods

actionpack/test/abstract_unit.rb

@@ -25,7 +25,6 @@
 require 'active_model'
 require 'active_record'
 require 'action_controller/caching'
-require 'action_controller/caching/sweeping'
 
 require 'pp' # require 'pp' early to prevent hidden_methods from not picking up the pretty-print methods until too late
 

actionpack/test/controller/filters_test.rb

@@ -499,18 +499,6 @@ def filter_three
 
   end
 
-  class ::AppSweeper < ActionController::Caching::Sweeper; end
-  class SweeperTestController < ActionController::Base
-    cache_sweeper :app_sweeper
-    def show
-      render :text => 'hello world'
-    end
-
-    def error
-      raise StandardError.new
-    end
-  end
-
   class ImplicitActionsController < ActionController::Base
     before_filter :find_only, :only => :edit
     before_filter :find_except, :except => :edit
@@ -526,35 +514,6 @@ def find_except
     end
   end
 
-  def test_sweeper_should_not_ignore_no_method_error
-    sweeper = ActionController::Caching::Sweeper.send(:new)
-    assert_raise NoMethodError do
-      sweeper.send_not_defined
-    end
-  end
-
-  def test_sweeper_should_not_block_rendering
-    response = test_process(SweeperTestController)
-    assert_equal 'hello world', response.body
-  end
-
-  def test_sweeper_should_clean_up_if_exception_is_raised
-    assert_raise StandardError do
-      test_process(SweeperTestController, 'error')
-    end
-    assert_nil AppSweeper.instance.controller
-  end
-
-  def test_before_method_of_sweeper_should_always_return_true
-    sweeper = ActionController::Caching::Sweeper.send(:new)
-    assert sweeper.before(TestController.new)
-  end
-
-  def test_after_method_of_sweeper_should_always_return_nil
-    sweeper = ActionController::Caching::Sweeper.send(:new)
-    assert_nil sweeper.after(TestController.new)
-  end
-
   def test_non_yielding_around_filters_not_returning_false_do_not_raise
     controller = NonYieldingAroundFilterController.new
     controller.instance_variable_set "@filter_return_value", true

activemodel/lib/active_model.rb

@@ -40,8 +40,6 @@ module ActiveModel
   autoload :DeprecatedMassAssignmentSecurity
   autoload :Name, 'active_model/naming'
   autoload :Naming
-  autoload :Observer, 'active_model/observing'
-  autoload :Observing
   autoload :SecurePassword
   autoload :Serialization
   autoload :TestCase