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

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",
 
   # The svn location to pull out dependencies from
@@ skipping 57 matching lines @@
   "intl_rev": "@32047558bd220a53c1f4d93a26d54b83533b1475",
   "jinja2_rev": "@2222b31554f03e62600cd7e383376a7c187967a1",
   "json_rpc_2_tag": "@1.1.1",
   "linter_tag": "@0.1.0",
   "logging_rev": "@85d83e002670545e9039ad3985f0018ab640e597",
   "markdown_rev": "@9a1071a859df9c9edd4f556e948f898f70bf1e5e",
   "matcher_tag": "@0.12.0",
   "metatest_rev": "@e5aa8e4e19fc4188ac2f6d38368a47d8f07c3df1",
   "mime_rev": "@75890811d4af5af080351ba8a2853ad4c8df98dd",
   "mustache4dart_rev" : "@5724cfd85151e5b6b53ddcd3380daf188fe47f92",
-  "net_nss_rev": "@f81948e9a402db94287a43bb34a07ee0daf56cb5",
-  "nss_rev": "@87b96db4268293187d7cf741907a6d5d1d8080e0",
   "oauth2_rev": "@1bff41f4d54505c36f2d1a001b83b8b745c452f5",
   "observe_rev": "@eee2b8ec34236fa46982575fbccff84f61202ac6",
   "observatory_pub_packages_rev": "@cdc4b3d4c15b9c0c8e7702dff127b440afbb7485",
   "package_config_rev": "@0.1.3",
   "path_tag": "@1.3.6",
   "petitparser_rev" : "@37878",
   "ply_rev": "@604b32590ffad5cbb82e4afef1d305512d06ae93",
   "plugin_tag": "@0.1.0",
   "pool_rev": "@e454b4b54d2987e8d2f0fbd3ac519641ada9bd0f",
   "pub_rev": "@1c08b841158e33b8090bb07e5c39df830db58d44",
   "pub_cache_tag": "@v0.1.0",
   "pub_semver_tag": "@1.2.1",
   "quiver_tag": "@0.21.4",
   "root_certificates_rev": "@c3a41df63afacec62fcb8135196177e35fe72f71",
   "scheduled_test_tag": "@0.12.1+2",
   "shelf_tag": "@0.6.2+1",
   "smoke_rev" : "@f3361191cc2a85ebc1e4d4c33aec672d7915aba9",
   "source_maps_tag": "@0.10.1",
-  "sqlite_rev": "@38811b79f42801662adc0458a25270ab690a6b81",
   "shelf_static_tag": "@0.2.3+1",
   "shelf_web_socket_tag": "@0.0.1+4",
   "source_map_stack_trace_tag": "@1.0.4",
   "source_span_tag": "@1.2.0",
   "stack_trace_tag": "@1.3.4",
   "string_scanner_tag": "@0.1.4",
   "sunflower_rev": "@879b704933413414679396b129f5dfa96f7a0b1e",
   "test_tag": "@0.12.3+8",
   "test_reflective_loader_tag": "@0.0.3",
   "utf_rev": "@1f55027068759e2d52f2c12de6a57cce5f3c5ee6",
@@ skipping 14 matching lines @@
 }
 
 deps = {
   # Stuff needed for GYP to run.
   Var("dart_root") + "/third_party/gyp":
       Var('chromium_git') + '/external/gyp.git' + Var("gyp_rev"),
 
   Var("dart_root") + "/tests/co19/src":
       (Var("github_mirror") % "co19") + Var("co19_rev"),
 
-  Var("dart_root") + "/third_party/nss":
-      Var("chromium_git") + "/chromium/deps/nss.git" + Var("nss_rev"),
-
-  Var("dart_root") + "/third_party/sqlite":
-      Var("chromium_git") + "/chromium/src/third_party/sqlite.git" +
-      Var("sqlite_rev"),
-
   Var("dart_root") + "/third_party/zlib":
       Var("chromium_git") + "/chromium/src/third_party/zlib.git" +
       Var("zlib_rev"),
 
-  Var("dart_root") + "/third_party/net_nss":
-      Var("chromium_git") + "/chromium/src/net/third_party/nss.git" +
-      Var("net_nss_rev"),
-
   Var("dart_root") + "/third_party/boringssl/src":
       "https://boringssl.googlesource.com/boringssl.git" +
       Var("boringssl_rev"),
 
   Var("dart_root") + "/third_party/root_certificates":
       "https://github.com/dart-lang/root_certificates.git" +
       Var("root_certificates_rev"),
 
   Var("dart_root") + "/third_party/jinja2":
       Var("chromium_git") + "/chromium/src/third_party/jinja2.git" +
@@ skipping 241 matching lines @@
       "--bucket",
       "dart-dependencies",
       "--recursive",
       "--auto_platform",
       "--extract",
       "--directory",
       Var('dart_root') + "/tools/sdks",
     ],
   },
 ]