Build shadow_dom package in dart/pkg

pkg/shadow_dom/lib/shadow_dom.min.js

Index: pkg/shadow_dom/lib/shadow_dom.min.js
diff --git a/pkg/shadow_dom/lib/shadow_dom.min.js b/pkg/shadow_dom/lib/shadow_dom.min.js
index e9d570e00100e118b6cd21ac0a68f7315666b492..888ec35c3d3ba44cf792ac1355f837fe58fdbd99 100644
--- a/pkg/shadow_dom/lib/shadow_dom.min.js
+++ b/pkg/shadow_dom/lib/shadow_dom.min.js
@@ -1,2 +1,2 @@
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