[Caja] Fixes regex bug in es53 (issue4602055)

[metaweta]

Reviewers: ihab.awad,

Description:
If a property name has a newline in it, then it fails to be enumerated
by
a for-in loop.

Please review this at http://codereview.appspot.com/4602055/

Affected files:
  M     src/com/google/caja/es53.js


Index: src/com/google/caja/es53.js
===================================================================
--- src/com/google/caja/es53.js (revision 4499)
+++ src/com/google/caja/es53.js (working copy)
@@ -1064,8 +1064,8 @@
   }

   var endsWith__ = /__$/;
-  var endsWith_e___ = /(.*?)_e___$/;
-  var endsWith_v___ = /(.*?)_v___$/;
+  var endsWith_e___ = /([\s\S]*?)_e___$/;
+  var endsWith_v___ = /([\s\S]*?)_v___$/;
   var startsWithNUM___ = /^NUM___/;

   function assertValidPropertyName(P) {