Privatize unneededly protected methods in Action Cable tests

actioncable/test/connection/identifier_test.rb

@@ -53,7 +53,7 @@ def connect
     end
   end
 
-  protected
+  private
     def open_connection_with_stubbed_pubsub
       server = TestServer.new
       server.stubs(:adapter).returns(stub_everything("adapter"))

actioncable/test/connection/multiple_identifiers_test.rb

@@ -19,7 +19,7 @@ def connect
     end
   end
 
-  protected
+  private
     def open_connection_with_stubbed_pubsub
       server = TestServer.new
       server.stubs(:pubsub).returns(stub_everything("pubsub"))

actioncable/test/connection/string_identifier_test.rb

@@ -21,7 +21,7 @@ def send_async(method, *args)
     end
   end
 
-  protected
+  private
     def open_connection_with_stubbed_pubsub
       @server = TestServer.new
       @server.stubs(:pubsub).returns(stub_everything("pubsub"))