Remove `page_cache_extension` deprecated method

actionpack/CHANGELOG.md

+*   Remove deprecated `page_cache_extension` config.
+
+    *Francesco Rodriguez*
+
 *   Remove deprecated constants from Action Controller:
 
         ActionController::AbstractRequest  => ActionDispatch::Request

actionpack/lib/action_controller/caching.rb

@@ -58,16 +58,6 @@ def cache_configured?
       config_accessor :default_static_extension
       self.default_static_extension ||= '.html'
 
-      def self.page_cache_extension=(extension)
-        ActiveSupport::Deprecation.deprecation_warning(:page_cache_extension, :default_static_extension)
-        self.default_static_extension = extension
-      end
-
-      def self.page_cache_extension
-        ActiveSupport::Deprecation.deprecation_warning(:page_cache_extension, :default_static_extension)
-        default_static_extension
-      end
-
       config_accessor :perform_caching
       self.perform_caching = true if perform_caching.nil?
 

actionpack/test/controller/caching_test.rb

@@ -312,18 +312,3 @@ def test_view_cache_dependencies_are_listed_in_declaration_order
     assert_equal %w(trombone flute), HasDependenciesController.new.view_cache_dependencies
   end
 end
-
-class DeprecatedPageCacheExtensionTest < ActiveSupport::TestCase
-  def test_page_cache_extension_binds_default_static_extension
-    deprecation_behavior = ActiveSupport::Deprecation.behavior
-    ActiveSupport::Deprecation.behavior = :silence
-    old_extension = ActionController::Base.default_static_extension
-
-    ActionController::Base.page_cache_extension = '.rss'
-
-    assert_equal '.rss', ActionController::Base.default_static_extension
-  ensure
-    ActiveSupport::Deprecation.behavior = deprecation_behavior
-    ActionController::Base.default_static_extension = old_extension
-  end
-end