Simplify error message logic in ParseImportNames

test/message/import-as-eval.out

Index: test/message/import-as-eval.out
diff --git a/test/message/import-as-eval.out b/test/message/import-as-eval.out
new file mode 100644
index 0000000000000000000000000000000000000000..622f7fe9e187d544b9d20e2e5a1cd6c175e4bd9e
--- /dev/null
+++ b/test/message/import-as-eval.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:7: SyntaxError: Unexpected eval or arguments in strict mode
+import { foo as eval } from "mod";
+                ^^^^
+SyntaxError: Unexpected eval or arguments in strict mode