use shared code transformer, update web_components to remove .map and .concat files

pkg/web_components/pubspec.yaml

Index: pkg/web_components/pubspec.yaml
diff --git a/pkg/web_components/pubspec.yaml b/pkg/web_components/pubspec.yaml
index 98b2d7fc4c09064b6c1445f202ed343cc45df766..4e6872bf7d804d3b5d70067fb25b0209b84131f3 100644
--- a/pkg/web_components/pubspec.yaml
+++ b/pkg/web_components/pubspec.yaml
@@ -1,5 +1,5 @@
 name: web_components
-version: 0.9.0
+version: 0.9.0+1
 author: Polymer.dart Authors <web-ui-dev@dartlang.org>
 homepage: https://www.dartlang.org/polymer-dart/
 description: >
@@ -11,3 +11,16 @@ description: >
   bundle code and HTML as if they were libraries.
 environment:
   sdk: ">=1.4.0-dev.6.6 <2.0.0"
+dependencies:
+  code_transformers: ">=0.2.2 <0.3.0"
+transformers:
+# 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.
+- code_transformers/src/delete_file:
+    $include:
+      - lib/platform.concat.js
+      - lib/platform.concat.js.map
+      - lib/platform.js.map
+- code_transformers/src/remove_sourcemap_comment:
+    $include: lib/platform.js