Update status file for language/prefix_core_test.

dart/tests/language/language.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.
 
 # This directory contains tests that are intended to show the
 # current state of the language.
 
 # In order to maintain maximum test coverage for all builds,
 # please use the following procedure to mark a test
 # failed on architectures other than the one you are working on.
@@ skipping 32 matching lines @@
 call_operator_test: Fail
 
 const_constructor_syntax_test/05: Fail
 
 constructor_redirect_test/01: Fail # Issue 2103.
 
 closure_with_super_send_test: Fail # Issue 3197.
 super_closure_test: Fail # Issue 3197.
 parameter_initializer6_negative_test: Fail # Issue 3502
 
+prefix_core_test: Fail # Issue 3638.
+
 # DartC or Frog specific tests that should not be run by the VM
 *dartc_test: Skip
 *dartc_negative_test: Skip
 *frog_test: Skip
 *frog_negative_test: Skip
 
 [ $compiler == none && $mode == debug ]
 gc_test: Skip  # Takes too long.
 
 [ $compiler == dartc ]
@@ skipping 349 matching lines @@
 
 [ $compiler == frog && $runtime == drt ]
 # these tests are inconsistent in frogium, investigate
 static_field1_run_negative_test: Pass # but error is not correct
 static_field2_run_negative_test: Pass # but error is not correct
 
 [ $compiler == frog && $mode == debug ]
 constructor_redirect1_negative_test: Skip # Undiagnosed infinite loop.
 constructor_redirect2_negative_test: Skip # Undiagnosed infinite loop.
 
+[ $browser ]
+prefix_core_test: Fail # Issue 2264.
+
 [ $compiler == frog && $runtime == none ]
 *: Skip
 
 [ $arch == simarm ]
 *: Skip
 
 [ $arch == arm ]
 *: Skip