remove smoke from the repo

pkg/smoke/pubspec.yaml

Index: pkg/smoke/pubspec.yaml
diff --git a/pkg/smoke/pubspec.yaml b/pkg/smoke/pubspec.yaml
deleted file mode 100644
index 3e4669fb7bc829002c265c0152f212e39b012c22..0000000000000000000000000000000000000000
--- a/pkg/smoke/pubspec.yaml
+++ /dev/null
@@ -1,24 +0,0 @@
-name: smoke
-version: 0.2.1+1
-author: Polymer.dart Authors <web-ui-dev@dartlang.org>
-homepage: "https://api.dartlang.org/apidocs/channels/be/#smoke"
-description: >
-  A restricted reflective system that uses mirrors at development time, but that
-  can be replaced with non-reflective calls using code generation. See README.md
-  for mode details.
-dependencies:
-  barback: ">=0.9.0 <0.16.0"
-  logging: ">=0.9.0 <0.10.0"
-  analyzer: ">=0.13.0 <0.23.0"
-# TODO(sigmund): once we have some easier way to do global app-level
-# transformers, we might want to remove this transformer here and only apply it
-# in apps that need it.
-transformers:
-- smoke/src/default_transformer:
-    $include: lib/src/implementation.dart
-dev_dependencies:
-  unittest: ">=0.10.0 <0.11.0"
-  path: ">=1.0.0 <2.0.0"
-  code_transformers: ">=0.2.0 <0.3.0"
-environment:
-  sdk: ">=1.3.0-dev.7.9 <2.0.0"