Re-introduce ImportDeclaration to the parser

test/message/import-redeclaration.out

Index: test/message/import-redeclaration.out
diff --git a/test/message/import-redeclaration.out b/test/message/import-redeclaration.out
new file mode 100644
index 0000000000000000000000000000000000000000..641948810f33d779af7fe054dd8206cfb7563575
--- /dev/null
+++ b/test/message/import-redeclaration.out
@@ -0,0 +1,7 @@
+# Copyright 2015 the V8 project authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+*%(basename)s:8: SyntaxError: Identifier 'foo' has already been declared
+import { foo } from "mod";
+         ^^^
+SyntaxError: Identifier 'foo' has already been declared