Remove support for script tags.

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

 // 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.
 
 part of tree;
 
 String unparse(Node node) {
   Unparser unparser = new Unparser();
   unparser.unparse(node);
   return unparser.result;
@@ skipping 459 matching lines @@
       sb.write('default:');
     }
     visit(node.statements);
   }
 
   unparseImportTag(String uri, [String prefix]) {
     final suffix = prefix == null ? '' : ' as $prefix';
     sb.write('import "$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);
     visit(node.catchBlocks);
     if (node.finallyKeyword != null) {
       addToken(node.finallyKeyword);
       visit(node.finallyBlock);
     }
   }
 
@@ skipping 111 matching lines @@
   }
 
   visitStatement(Statement node) {
     throw 'internal error'; // Should not be called.
   }
 
   visitStringNode(StringNode node) {
     throw 'internal error'; // Should not be called.
   }
 }