Move the serial_port native code

DEPS

 # Copyright (c) 2015, the Dartino 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.md file.
 
 
 vars = {
   # NOTE: This revision will be used for looking at
   #   gs://chromium-browser-clang/Mac/clang-<rev>-1.tgz
   #   gs://chromium-browser-clang/Linux_x64/clang-<rev>-1.tgz
   "clang_rev": "245965",
@@ skipping 208 matching lines @@
     'name': 'serial_port_binaries',
     'pattern': '.',
     'action': [
       'download_from_google_storage',
       '-q',
       '--no_auth',
       '--no_resume',
       '--bucket',
       'dartino-dependencies',
       '-d',
-      'sdk/third_party/serial_port/lib/src/',
+      'sdk/third_party/serial_port/lib/',
     ],
   },
   {
     # Update the Windows toolchain if necessary.
     'name': 'win_toolchain',
     'pattern': '.',
     'action': ['python',
                'sdk/tools/vs_dependency/vs_toolchain.py',
                'update'],
   },
@@ skipping 168 matching lines @@
     'name': 'GYP',
     'pattern': '.',
     'action': [
       'python',
       'sdk/tools/run-ninja.py',
       '-C',
       'sdk',
     ],
   },
 ]