Module#delegate stop accepting the private as: parameter

The feature remains usable internally, but via `ActiveSupport::Delegation`,
this way we don't allow third party use.

actioncable/lib/action_cable/channel/broadcasting.rb

@@ -35,7 +35,7 @@ def serialize_broadcasting(object) # :nodoc:
         end
       end
 
-      delegate :broadcasting_for, :broadcast_to, to: :class, as: ClassMethods
+      ActiveSupport::Delegation.generate(self, [:broadcasting_for, :broadcast_to], to: :class, as: ClassMethods)
     end
   end
 end

actioncable/lib/action_cable/channel/naming.rb

@@ -18,7 +18,7 @@ def channel_name
         end
       end
 
-      delegate :channel_name, to: :class, as: ClassMethods
+      ActiveSupport::Delegation.generate(self, [:channel_name], to: :class, as: ClassMethods)
     end
   end
 end

activesupport/lib/active_support/core_ext/module/delegation.rb

@@ -157,7 +157,7 @@ class Module
   #   Foo.new("Bar").name # raises NoMethodError: undefined method `name'
   #
   # The target method must be public, otherwise it will raise +NoMethodError+.
-  def delegate(*methods, to: nil, prefix: nil, allow_nil: nil, private: nil, as: nil)
+  def delegate(*methods, to: nil, prefix: nil, allow_nil: nil, private: nil)
     ::ActiveSupport::Delegation.generate(
       self,
       methods,
@@ -166,7 +166,6 @@ def delegate(*methods, to: nil, prefix: nil, allow_nil: nil, private: nil, as: n
       prefix: prefix,
       allow_nil: allow_nil,
       private: private,
-      as: as,
     )
   end
 

activesupport/lib/active_support/current_attributes.rb

@@ -132,7 +132,7 @@ def attribute(*names, default: nil)
           end
         end
 
-        singleton_class.delegate(*names.flat_map { |name| [name, "#{name}="] }, to: :instance, as: self)
+        Delegation.generate(singleton_class, names.flat_map { |name| [name, "#{name}="] }, to: :instance, as: self)
 
         self.defaults = defaults.merge(names.index_with { default })
       end
@@ -184,7 +184,7 @@ def method_added(name)
           return if name == :initialize
           return unless public_method_defined?(name)
           return if respond_to?(name, true)
-          singleton_class.delegate(name, to: :instance, as: self)
+          Delegation.generate(singleton_class, [name], to: :instance, as: self)
         end
     end
 

activesupport/lib/active_support/duration.rb

@@ -221,7 +221,7 @@ def calculate_total_seconds(parts)
         end
     end
 
-    delegate :to_f, :positive?, :negative?, :zero?, :abs, to: :@value, as: Integer
+    Delegation.generate(self, [:to_f, :positive?, :negative?, :zero?, :abs], to: :@value, as: Integer)
 
     def initialize(value, parts, variable = nil) # :nodoc:
       @value, @parts = value, parts