remove deprecated `BufferedLogger`.

activesupport/CHANGELOG.md

+*   Remove deprecated `BufferedLogger`.
+
+    *Yves Senn*
+
 *   Remove deprecated `assert_present` and `assert_blank` methods.
 
     *Yves Senn*

activesupport/lib/active_support/buffered_logger.rb

-require 'active_support/deprecation'
-require 'active_support/logger'
-
-module ActiveSupport
-  class BufferedLogger < Logger
-
-    def initialize(*args)
-      self.class._deprecation_warning
-      super
-    end
-
-    def self.inherited(*)
-      _deprecation_warning
-      super
-    end
-
-    def self._deprecation_warning
-      ::ActiveSupport::Deprecation.warn 'ActiveSupport::BufferedLogger is deprecated! Use ActiveSupport::Logger instead.'
-    end
-  end
-end

activesupport/lib/active_support/log_subscriber/test_helper.rb

 require 'active_support/log_subscriber'
-require 'active_support/buffered_logger'
 require 'active_support/notifications'
 
 module ActiveSupport

activesupport/test/deprecation/buffered_logger_test.rb

-require 'abstract_unit'
-require 'active_support/buffered_logger'
-
-class BufferedLoggerTest < ActiveSupport::TestCase
-
-  def test_can_be_subclassed
-    warn = 'ActiveSupport::BufferedLogger is deprecated! Use ActiveSupport::Logger instead.'
-
-    ActiveSupport::Deprecation.expects(:warn).with(warn).once
-
-    Class.new(ActiveSupport::BufferedLogger)
-  end
-
-  def test_issues_deprecation_when_instantiated
-    warn = 'ActiveSupport::BufferedLogger is deprecated! Use ActiveSupport::Logger instead.'
-
-    ActiveSupport::Deprecation.expects(:warn).with(warn).once
-
-    ActiveSupport::BufferedLogger.new(STDOUT)
-  end
-
-end