Bring in version 3.0.3 of http_parser; it addresses an issue in the pubspec file of

DEPS

 # 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.
 
 vars = {
   # The dart_root is the root of our sdk checkout. This is normally
   # simply sdk, but if using special gclient specs it can be different.
   "dart_root": "sdk",
 
   # We use mirrors of all github repos to guarantee reproducibility and
@@ skipping 46 matching lines @@
   "csslib_tag" : "@0.13.2",
   "dart2js_info_tag" : "@0.5.0",
   "dart_services_rev" : "@7aea2574e6f3924bf409a80afb8ad52aa2be4f97",
   "dart_style_rev": "@a2b84e46a9e4044e61e3cc130087c18da40b9665",
   "dartdoc_tag" : "@v0.9.7+6",
   "fixnum_tag": "@0.10.5",
   "func_tag": "@0.1.0",
   "glob_tag": "@1.1.3",
   "html_tag" : "@0.13.1",
   "http_multi_server_tag" : "@2.0.2",
-  "http_parser_tag" : "@3.0.2",
+  "http_parser_tag" : "@3.0.3",
   "http_tag" : "@0.11.3+9",
   "http_throttle_rev" : "@284344cd357e435c6c8ff9a4a21f02b9e384a541",
   "idl_parser_rev": "@7fbe68cab90c38147dee4f48c30ad0d496c17915",
   "initialize_tag": "@v0.6.2+2",
   "intl_tag": "@0.14.0",
   "isolate_tag": "@0.2.3",
   "jinja2_rev": "@2222b31554f03e62600cd7e383376a7c187967a1",
   "json_rpc_2_tag": "@2.0.2",
   "kernel_rev": "@11edd6208940d227dc0b2cf87a6518d2508c0858",
   "linter_tag": "@0.1.28",
@@ skipping 517 matching lines @@
     # Update the Windows toolchain if necessary.
     'name': 'win_toolchain',
     'pattern': '.',
     'action': ['python', 'sdk/build/vs_toolchain.py', 'update'],
   },
   {
     "pattern": ".",
     "action": ["python", Var("dart_root") + "/tools/generate_buildfiles.py"],
   },
 ]