Revert 17963, 17962 and 17955: Random number generator in JS changes

src/heap.cc

Index: src/heap.cc
diff --git a/src/heap.cc b/src/heap.cc
index dcab156377005c3918c7875d2c6e76a01286e4a8..b5fe18454e31005d64bb7e611a25dd60449eea67 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -1765,9 +1765,7 @@ struct WeakListVisitor<Context> {
     }
   }
 
-  static void VisitPhantomObject(Heap*, Context* context) {
-    // A bit of a hack, see the comment at the end of Genesis::Genesis().
-    delete[] reinterpret_cast<uint32_t*>(context->random_state());
+  static void VisitPhantomObject(Heap*, Context*) {
   }
 
   static int WeakNextOffset() {