Remove checkout of NSS and sqlite from DEPS, remove support files.

runtime/bin/bin.gypi

 # 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.
 
 {
   'variables': {
     'gen_source_dir': '<(SHARED_INTERMEDIATE_DIR)',
 
     'io_cc_file': '<(gen_source_dir)/io_gen.cc',
     'io_patch_cc_file': '<(gen_source_dir)/io_patch_gen.cc',
@@ skipping 277 matching lines @@
       'includes': [
         'io_impl_sources.gypi',
       ],
       'sources': [
         'io_natives.h',
         'io_natives.cc',
       ],
       'conditions': [
         ['dart_io_support==1', {
           'dependencies': [
-            'bin/net/zlib.gyp:zlib_dart',
+            'bin/zlib.gyp:zlib_dart',
           ],
         }],
         ['dart_io_support==1 and dart_io_secure_socket==1', {
           'dependencies': [
             '../third_party/boringssl/boringssl_dart.gyp:boringssl',
           ],
         }],
         ['dart_io_secure_socket==0', {
           'defines': [
             'DART_IO_SECURE_SOCKET_DISABLED'
@@ skipping 496 matching lines @@
         }],
         ['OS=="linux"', {
           'cflags': [
             '-fPIC',
           ],
         }],
       ],
     },
   ],
 }