Remove runtime flags for Proxy and Reflect

test/mjsunit/es6/regress/regress-2225.js

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-// Flags: --harmony-proxies
-
 var proxy_has_x = false;
 var proxy = new Proxy({}, {
   get(t, key, receiver) {
     assertSame('x', key);
     if (proxy_has_x) { return 19 }
     return 8;
   }
 });
 
 // Test __lookupGetter__/__lookupSetter__ with proxy.
@@ skipping 27 matching lines @@
 G.prototype.__proto__ = proxy;
 instance = new G();
 
 proxy_has_x = false;
 assertSame(42, instance.x);
 delete instance.x;
 assertSame(8, instance.x);
 
 proxy_has_x = true;
 assertSame(19, instance.x);