Reenable WebSocket test that timed out on MacOS in debug mode.

tests/standalone/standalone.status

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 TimeoutTest: Skip  # Timeout test for testing the test runner.
 FailTest: Fail, OK # Fails intentionally
 OutOfMemoryTest: Skip # Issue 2345
 
 package/InvalidUriTest: Fail, OK # Fails intentionally
 
 [ $runtime == vm && $checked ]
 # These tests have type errors on purpose.
 io/ProcessInvalidArgumentsTest: Fail, OK
 io/DirectoryInvalidArgumentsTest: Fail, OK
 io/FileInvalidArgumentsTest: Fail, OK
 
 [ $runtime == vm]
 io/ManyEchoServerTest: Skip        # Bug 5103754
 # These tests fail, crash, and timeout to test the testing infrastructure.
 io/TestExtensionTest: Fail  # shared library in wrong place (issue 1817)
 
 [ $runtime == vm && $system == macos]
 # This test fails with "Too many open files" on the Mac OS buildbot.
 io/SocketManyConnectionsTest: Skip
 io/TestExtensionTest: Skip  # Extensions not implemented on MacOS
 io/HttpServerHandlerTest: Skip # Issue 2637
-io/WebSocketProtocolProcessorTest: Skip # Issue 2755
 
 [ $runtime == vm && $system == windows]
 io/TestExtensionTest: Skip  # Extensions not implemented on Windows
 io/HttpShutdownTest: Skip  # Currently times out on windows
 
 [ $compiler == none && $runtime == drt ]
 io/*: Skip # Don't run tests using dart:io in the browser
 crypto/*: Skip # Don't run tests using dart:io in the browser
 package/*: Skip # Do not run those in Dartium.
 
 [ $compiler == dartc]
 *: Skip
 
 [ $compiler == frog || ($compiler == dart2js && $runtime == drt) ]
 *: Skip
 
 [ $arch == x64 ]
 MediumIntegerTest: Fail # Issue 1146.
 
 
 [ $arch == arm ]
 *: Skip
 
 
 [ $arch == simarm ]
 *: Skip