Remove DRT specific suppression, should be covered by generic x64 suppression below.

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.
 
 out_of_memory_test: Skip # Issue 2345
 
 package/invalid_uri_test: Fail, OK # Fails intentionally
 
 [ $runtime == vm && $checked ]
 # These tests have type errors on purpose.
@@ skipping 20 matching lines @@
 [ $runtime == vm && $system == windows]
 io/http_shutdown_test: Skip  # Currently times out on windows
 io/file_system_links_test: Skip  # No links on Windows.
 io/http_connection_header_test: Pass, Fail  # Issue 2959
 
 [ $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 == none && $runtime == drt && $system == linux ]
-medium_integer_test: Fail # Issue 1146.  linux => x64.
-
 [ $compiler == dartc]
 *: Skip
 
 [ $compiler == frog ]
 *: Skip
 
 [ $arch == x64 ]
 medium_integer_test: Fail # Issue 1146.
 
 
@@ skipping 25 matching lines @@
 io/options_test: Fail
 
 [$compiler == dart2js && $browser ]
 *: Skip
 
 [$compiler == dart2js && $checked ]
 io/http_read_test: Skip # Timeout TODO(ngeoffray): investigate
 io/list_input_stream_test: Skip # Timeout TODO(ngeoffray): investigate
 io/http_headers_test: Fail # TODO(floitsch): I'm on it.
 io/http_date_test: Fail # TODO(floitsch): I'm on it.