Update DEPS to use chromium mirrors of more package repos

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 163 matching lines @@
       Var('chromium_git') + '/external/github.com/gperftools/gperftools.git' +
       Var("gperftools_revision"),
 
   Var("dart_root") + "/third_party/pkg/args":
       (Var("github_mirror") % "args") + Var("args_tag"),
   Var("dart_root") + "/third_party/pkg/async":
       (Var("github_mirror") % "async") + Var("async_tag"),
   Var("dart_root") + "/third_party/pkg/barback":
       (Var("github_mirror") % "barback") + Var("barback_tag"),
   Var("dart_root") + "/third_party/pkg/bazel_worker":
-      (Var("github_dartlang") % "bazel_worker") + Var("bazel_worker_tag"),
+      (Var("github_mirror") % "bazel_worker") + Var("bazel_worker_tag"),
   Var("dart_root") + "/third_party/pkg/boolean_selector":
-      (Var("github_dartlang") % "boolean_selector") +
+      (Var("github_mirror") % "boolean_selector") +
       Var("boolean_selector_tag"),
   Var("dart_root") + "/third_party/pkg/charcode":
       (Var("github_mirror") % "charcode") + Var("charcode_tag"),
   Var("dart_root") + "/third_party/pkg/cli_util":
       (Var("github_mirror") % "cli_util") + Var("cli_util_tag"),
   Var("dart_root") + "/third_party/pkg/collection":
       (Var("github_mirror") % "collection") + Var("collection_tag"),
   Var("dart_root") + "/third_party/pkg/convert":
       (Var("github_mirror") % "convert") + Var("convert_tag"),
   Var("dart_root") + "/third_party/pkg/crypto":
       (Var("github_mirror") % "crypto") + Var("crypto_tag"),
   Var("dart_root") + "/third_party/pkg/csslib":
       (Var("github_mirror") % "csslib") + Var("csslib_tag"),
   Var("dart_root") + "/third_party/pkg/code_transformers":
-      (Var("github_dartlang") % "code_transformers") +
+      (Var("github_mirror") % "code_transformers") +
       Var("code_transformers_tag"),
   Var("dart_root") + "/third_party/dart-services":
       (Var("github_mirror") % "dart-services") +
       Var("dart_services_rev"),
   Var("dart_root") + "/third_party/pkg_tested/dart_style":
       (Var("github_mirror") % "dart_style") + Var("dart_style_tag"),
   Var("dart_root") + "/third_party/pkg/dart2js_info":
       (Var("github_mirror") % "dart2js_info") + Var("dart2js_info_tag"),
   Var("dart_root") + "/third_party/pkg/dartdoc":
       (Var("github_mirror") % "dartdoc") + Var("dartdoc_tag"),
+  Var("dart_root") + "/third_party/pkg/fixnum":
+      (Var("github_mirror") % "fixnum") + Var("fixnum_tag"),
   Var("dart_root") + "/third_party/pkg/func":
-      (Var("github_dartlang") % "func") + Var("func_tag"),
-  Var("dart_root") + "/third_party/pkg/fixnum":
-      "https://github.com/dart-lang/fixnum.git" + Var("fixnum_tag"),
+      (Var("github_mirror") % "func") + Var("func_tag"),
   Var("dart_root") + "/third_party/pkg/glob":
       (Var("github_mirror") % "glob") + Var("glob_tag"),
   Var("dart_root") + "/third_party/pkg/html":
       (Var("github_mirror") % "html") + Var("html_tag"),
   Var("dart_root") + "/third_party/pkg/http":
       (Var("github_mirror") % "http") + Var("http_tag"),
   Var("dart_root") + "/third_party/pkg/http_multi_server":
       (Var("github_mirror") % "http_multi_server") +
       Var("http_multi_server_tag"),
   Var("dart_root") + "/third_party/pkg/http_parser":
       (Var("github_mirror") % "http_parser") + Var("http_parser_tag"),
   Var("dart_root") + "/third_party/pkg/http_throttle":
       (Var("github_mirror") % "http_throttle") +
       Var("http_throttle_rev"),
   Var("dart_root") + "/third_party/pkg/initialize":
-      (Var("github_dartlang") % "initialize") + Var("initialize_tag"),
+      (Var("github_mirror") % "initialize") + Var("initialize_tag"),
   Var("dart_root") + "/third_party/pkg/intl":
       (Var("github_mirror") % "intl") + Var("intl_tag"),
   Var("dart_root") + "/third_party/pkg/isolate":
-      (Var("github_dartlang") % "isolate") + Var("isolate_tag"),
+      (Var("github_mirror") % "isolate") + Var("isolate_tag"),
   Var("dart_root") + "/third_party/pkg/json_rpc_2":
       (Var("github_mirror") % "json_rpc_2") + Var("json_rpc_2_tag"),
   Var("dart_root") + "/third_party/pkg/linter":
       (Var("github_mirror") % "linter") + Var("linter_rev"),
   Var("dart_root") + "/third_party/pkg/logging":
       (Var("github_mirror") % "logging") + Var("logging_tag"),
   Var("dart_root") + "/third_party/pkg/markdown":
       (Var("github_mirror") % "markdown") + Var("markdown_tag"),
   Var("dart_root") + "/third_party/pkg/matcher":
       (Var("github_mirror") % "matcher") + Var("matcher_tag"),
@@ skipping 11 matching lines @@
       (Var("github_dartlang") % "observable") + Var("observable_tag"),
   Var("dart_root") + "/third_party/pkg/observe":
       (Var("github_mirror") % "observe") + Var("observe_tag"),
   Var("dart_root") + "/third_party/observatory_pub_packages":
      (Var("github_mirror") % "observatory_pub_packages")
       + Var("observatory_pub_packages_rev"),
   Var("dart_root") + "/third_party/pkg_tested/package_config":
       (Var("github_mirror") % "package_config") +
       Var("package_config_tag"),
   Var("dart_root") + "/third_party/pkg_tested/package_resolver":
-      "https://github.com/dart-lang/package_resolver.git" +
-      Var("package_resolver_tag"),
+      (Var("github_mirror") % "package_resolver") + Var("package_resolver_tag"),
   Var("dart_root") + "/third_party/pkg/path":
       (Var("github_mirror") % "path") + Var("path_tag"),
   Var("dart_root") + "/third_party/pkg/plugin":
       (Var("github_mirror") % "plugin") + Var("plugin_tag"),
   Var("dart_root") + "/third_party/pkg/pool":
       (Var("github_mirror") % "pool") + Var("pool_tag"),
   Var("dart_root") + "/third_party/pkg/protobuf":
-      (Var("github_dartlang") % "dart-protobuf") + Var("protobuf_tag"),
+      (Var("github_mirror") % "dart-protobuf") + Var("protobuf_tag"),
   Var("dart_root") + "/third_party/pkg/pub_semver":
       (Var("github_mirror") % "pub_semver") + Var("pub_semver_tag"),
   Var("dart_root") + "/third_party/pkg/pub":
       (Var("github_mirror") % "pub") + Var("pub_rev"),
   Var("dart_root") + "/third_party/pkg/quiver":
       Var("chromium_git")
       + "/external/github.com/google/quiver-dart.git"
       + Var("quiver_tag"),
   Var("dart_root") + "/third_party/pkg/resource":
       (Var("github_mirror") % "resource") + Var("resource_rev"),
@@ skipping 14 matching lines @@
   Var("dart_root") + "/third_party/pkg/source_maps":
       (Var("github_mirror") % "source_maps") + Var("source_maps_tag"),
   Var("dart_root") + "/third_party/pkg/source_span":
       (Var("github_mirror") % "source_span") + Var("source_span_tag"),
   Var("dart_root") + "/third_party/pkg/source_map_stack_trace":
       (Var("github_mirror") % "source_map_stack_trace") +
       Var("source_map_stack_trace_tag"),
   Var("dart_root") + "/third_party/pkg/stack_trace":
       (Var("github_mirror") % "stack_trace") + Var("stack_trace_tag"),
   Var("dart_root") + "/third_party/pkg/stream_channel":
-      (Var("github_dartlang") % "stream_channel") +
+      (Var("github_mirror") % "stream_channel") +
       Var("stream_channel_tag"),
   Var("dart_root") + "/third_party/pkg/string_scanner":
       (Var("github_mirror") % "string_scanner") +
       Var("string_scanner_tag"),
   Var("dart_root") + "/third_party/sunflower":
       (Var("github_mirror") % "sample-sunflower") +
       Var("sunflower_rev"),
   Var("dart_root") + "/third_party/pkg/test":
       (Var("github_mirror") % "test") + Var("test_tag"),
   Var("dart_root") + "/third_party/pkg/test_reflective_loader":
       (Var("github_mirror") % "test_reflective_loader") +
       Var("test_reflective_loader_tag"),
   Var("dart_root") + "/third_party/pkg/typed_data":
-      (Var("github_dartlang") % "typed_data") + Var("typed_data_tag"),
+      (Var("github_mirror") % "typed_data") + Var("typed_data_tag"),
   Var("dart_root") + "/third_party/pkg/usage":
       (Var("github_mirror") % "usage") + Var("usage_tag"),
   Var("dart_root") + "/third_party/pkg/utf":
       (Var("github_mirror") % "utf") + Var("utf_tag"),
   Var("dart_root") + "/third_party/pkg/watcher":
       (Var("github_mirror") % "watcher") + Var("watcher_tag"),
   Var("dart_root") + "/third_party/pkg/web_components":
       (Var("github_mirror") % "web-components") +
       Var("web_components_rev"),
   Var("dart_root") + "/third_party/pkg/web_socket_channel":
-      (Var("github_dartlang") % "web_socket_channel") +
+      (Var("github_mirror") % "web_socket_channel") +
       Var("web_socket_channel_tag"),
   Var("dart_root") + "/third_party/pkg/when":
       (Var("github_mirror") % "when") + Var("when_tag"),
   Var("dart_root") + "/third_party/pkg/which":
       (Var("github_mirror") % "which") + Var("which_tag"),
   Var("dart_root") + "/third_party/pkg/yaml":
       (Var("github_mirror") % "yaml") + Var("yaml_tag"),
 }
 
 deps_os = {
@@ skipping 248 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"],
   },
 ]