Remove JRuby-specific SocketPoller#listening?

The bug it worked around has been fixed in JRuby 1.6.7
(http://jruby.org/2012/02/22/jruby-1-6-7)

rb/lib/selenium/webdriver/common/socket_poller.rb

@@ -61,37 +61,26 @@ def closed?
       CONNECTED_ERRORS << Errno::EINVAL if Platform.windows?
       CONNECTED_ERRORS << Errno::EALREADY if Platform.wsl?
 
-      if Platform.jruby?
-        # we use a plain TCPSocket here since JRuby has issues select()ing on a connecting socket
-        # see http://jira.codehaus.org/browse/JRUBY-5165
-        def listening?
-          TCPSocket.new(@host, @port).close
-          true
-        rescue *NOT_CONNECTED_ERRORS
-          false
-        end
-      else
-        def listening?
-          addr     = Socket.getaddrinfo(@host, @port, Socket::AF_INET, Socket::SOCK_STREAM)
-          sock     = Socket.new(Socket::AF_INET, Socket::SOCK_STREAM, 0)
-          sockaddr = Socket.pack_sockaddr_in(@port, addr[0][3])
-
-          begin
-            sock.connect_nonblock sockaddr
-          rescue Errno::EINPROGRESS
-            retry if IO.select(nil, [sock], nil, CONNECT_TIMEOUT)
-            raise Errno::ECONNREFUSED
-          rescue *CONNECTED_ERRORS
-            # yay!
-          end
-
-          sock.close
-          true
-        rescue *NOT_CONNECTED_ERRORS
-          sock.close if sock
-          WebDriver.logger.debug("polling for socket on #{[@host, @port].inspect}")
-          false
+      def listening?
+        addr     = Socket.getaddrinfo(@host, @port, Socket::AF_INET, Socket::SOCK_STREAM)
+        sock     = Socket.new(Socket::AF_INET, Socket::SOCK_STREAM, 0)
+        sockaddr = Socket.pack_sockaddr_in(@port, addr[0][3])
+
+        begin
+          sock.connect_nonblock sockaddr
+        rescue Errno::EINPROGRESS
+          retry if IO.select(nil, [sock], nil, CONNECT_TIMEOUT)
+          raise Errno::ECONNREFUSED
+        rescue *CONNECTED_ERRORS
+          # yay!
         end
+
+        sock.close
+        true
+      rescue *NOT_CONNECTED_ERRORS
+        sock.close if sock
+        WebDriver.logger.debug("polling for socket on #{[@host, @port].inspect}")
+        false
       end
 
       def with_timeout

rb/spec/unit/selenium/webdriver/socket_poller_spec.rb

@@ -24,21 +24,10 @@ module WebDriver
       let(:socket) { double Socket, close: true }
 
       def setup_connect(*states)
-        # TODO(jari): find a cleaner way to solve the platform-specific collaborators
-        if Platform.jruby?
-          states.each do |state|
-            if state
-              expect(TCPSocket).to receive(:new).and_return socket
-            else
-              expect(TCPSocket).to receive(:new).and_raise Errno::ECONNREFUSED
-            end
-          end
-        else
-          allow(Socket).to receive(:new).and_return socket
-          states.each do |state|
-            expect(socket).to receive(:connect_nonblock)
-              .and_raise(state ? Errno::EISCONN.new('connection in progress') : Errno::ECONNREFUSED.new('connection refused'))
-          end
+        allow(Socket).to receive(:new).and_return socket
+        states.each do |state|
+          expect(socket).to receive(:connect_nonblock)
+            .and_raise(state ? Errno::EISCONN.new('connection in progress') : Errno::ECONNREFUSED.new('connection refused'))
         end
       end