Fix editor warnings in http_server and mime.

pkg/mime/lib/src/extension_map.dart

 // Copyright (c) 2013, 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.
 
 part of mime;
 
 
 // TODO(ajohnsen): Use sorted list and binary search?
 Map<String, String> _defaultExtensionMap = const <String, String>{
 '123':'application/vnd.lotus-1-2-3',
@@ skipping 741 matching lines @@
 'ssml':'application/ssml+xml',
 'st':'application/vnd.sailingtracker.track',
 'stc':'application/vnd.sun.xml.calc.template',
 'std':'application/vnd.sun.xml.draw.template',
 'stf':'application/vnd.wt.stf',
 'sti':'application/vnd.sun.xml.impress.template',
 'stk':'application/hyperstudio',
 'stl':'application/vnd.ms-pki.stl',
 'str':'application/vnd.pg.format',
 'stw':'application/vnd.sun.xml.writer.template',
-'sub':'image/vnd.dvb.subtitle',
 'sub':'text/vnd.dvb.subtitle',
 'sus':'application/vnd.sus-calendar',
 'susp':'application/vnd.sus-calendar',
 'sv4cpio':'application/x-sv4cpio',
 'sv4crc':'application/x-sv4crc',
 'svc':'application/vnd.dvb.service',
 'svd':'application/vnd.svd',
 'svg':'image/svg+xml',
 'svgz':'image/svg+xml',
 'swa':'application/x-director',
@@ skipping 123 matching lines @@
 'wma':'audio/x-ms-wma',
 'wmd':'application/x-ms-wmd',
 'wmf':'application/x-msmetafile',
 'wml':'text/vnd.wap.wml',
 'wmlc':'application/vnd.wap.wmlc',
 'wmls':'text/vnd.wap.wmlscript',
 'wmlsc':'application/vnd.wap.wmlscriptc',
 'wmv':'video/x-ms-wmv',
 'wmx':'video/x-ms-wmx',
 'wmz':'application/x-ms-wmz',
-'wmz':'application/x-msmetafile',
 'woff':'application/x-font-woff',
 'wpd':'application/vnd.wordperfect',
 'wpl':'application/vnd.ms-wpl',
 'wps':'application/vnd.ms-works',
 'wqd':'application/vnd.wqd',
 'wri':'application/x-mswrite',
 'wrl':'model/vrml',
 'wsdl':'application/wsdl+xml',
 'wspolicy':'application/wspolicy+xml',
 'wtb':'application/vnd.webturbo',
@@ skipping 67 matching lines @@
 'z5':'application/x-zmachine',
 'z6':'application/x-zmachine',
 'z7':'application/x-zmachine',
 'z8':'application/x-zmachine',
 'zaz':'application/vnd.zzazz.deck+xml',
 'zip':'application/zip',
 'zir':'application/vnd.zul',
 'zirz':'application/vnd.zul',
 'zmm':'application/vnd.handheld-entertainment+xml',
 };