Lazily define escape and unescape (via js_InitStringClass) only #ifndef MOZILLA_CLIENT, because the DOM must predefine backward-compatible versions of these functions that 'stick' (42221, r=mccabe).

js/src/jsapi.c

@@ -1117,8 +1117,11 @@ static JSStdName standard_class_names[] = {
     {js_InitNumberClass,        TAG_CHAR_STRING(js_parseInt_str)},
 
     /* String global functions. */
+#ifndef MOZILLA_CLIENT
+    /* These two are predefined in a backward-compatible way by the DOM. */
     {js_InitStringClass,        TAG_CHAR_STRING(js_escape_str)},
     {js_InitStringClass,        TAG_CHAR_STRING(js_unescape_str)},
+#endif
     {js_InitStringClass,        TAG_CHAR_STRING(js_decodeURI_str)},
     {js_InitStringClass,        TAG_CHAR_STRING(js_encodeURI_str)},
     {js_InitStringClass,        TAG_CHAR_STRING(js_decodeURIComponent_str)},