Remove support for script tags.

sdk/lib/_internal/compiler/implementation/tree/unparser.dart

Index: sdk/lib/_internal/compiler/implementation/tree/unparser.dart
diff --git a/sdk/lib/_internal/compiler/implementation/tree/unparser.dart b/sdk/lib/_internal/compiler/implementation/tree/unparser.dart
index 274117bdac3ad51903020f1ce220f2e85d8df50d..92d10e36aa8c0ee4982e4f2620b15b0516b08aee 100644
--- a/sdk/lib/_internal/compiler/implementation/tree/unparser.dart
+++ b/sdk/lib/_internal/compiler/implementation/tree/unparser.dart
@@ -477,20 +477,6 @@ class Unparser implements Visitor {
     sb.write('import "$uri"$suffix;');
   }
 
-  visitScriptTag(ScriptTag node) {
-    add(node.beginToken.value);
-    visit(node.tag);
-    sb.write('(');
-    visit(node.argument);
-    if (node.prefixIdentifier != null) {
-      visit(node.prefixIdentifier);
-      sb.write(':');
-      visit(node.prefix);
-    }
-    sb.write(')');
-    add(node.endToken.value);
-  }
-
   visitTryStatement(TryStatement node) {
     addToken(node.tryKeyword);
     visit(node.tryBlock);