Added validating JSON parser mode to parser.

test/mjsunit/debug-compile-event.js

Index: test/mjsunit/debug-compile-event.js
diff --git a/test/mjsunit/debug-compile-event.js b/test/mjsunit/debug-compile-event.js
index 4804ac772d98f9ac1503659797f4d58fd569e199..071183bf6e4f2de12fa86bea5d1379fce7e4fb08 100644
--- a/test/mjsunit/debug-compile-event.js
+++ b/test/mjsunit/debug-compile-event.js
@@ -107,7 +107,7 @@ compileSource('eval("a=2")');
 source_count++;  // Using eval causes additional compilation event.
 compileSource('eval("eval(\'(function(){return a;})\')")');
 source_count += 2;  // Using eval causes additional compilation event.
-compileSource('JSON.parse("{a:1,b:2}")');
+compileSource('JSON.parse(\'{"a":1,"b":2}\')');
 source_count++;  // Using JSON.parse causes additional compilation event.
 
 // Make sure that the debug event listener was invoked.