[d8] Use ValueSerializer for postMessage (instead of ad-hoc serializer)

test/mjsunit/harmony/futex.js

Index: test/mjsunit/harmony/futex.js
diff --git a/test/mjsunit/harmony/futex.js b/test/mjsunit/harmony/futex.js
index 6790988678eb27c200185da4a7cb45e51ef140ab..13a6995c2ad02015633865635b22f5a2790de11f 100644
--- a/test/mjsunit/harmony/futex.js
+++ b/test/mjsunit/harmony/futex.js
@@ -120,7 +120,7 @@ if (this.Worker) {
        };`;
 
     var worker = new Worker(workerScript);
-    worker.postMessage({sab: sab, offset: offset}, [sab]);
+    worker.postMessage({sab: sab, offset: offset});
 
     // Spin until the worker is waiting on the futex.
     while (%AtomicsNumWaitersForTesting(i32a, 0) != 1) {}
@@ -132,7 +132,7 @@ if (this.Worker) {
     var worker2 = new Worker(workerScript);
     var offset = 8;
     var i32a2 = new Int32Array(sab, offset);
-    worker2.postMessage({sab: sab, offset: offset}, [sab]);
+    worker2.postMessage({sab: sab, offset: offset});
 
     // Spin until the worker is waiting on the futex.
     while (%AtomicsNumWaitersForTesting(i32a2, 0) != 1) {}
@@ -144,7 +144,7 @@ if (this.Worker) {
     // the real address is the same.
     var worker3 = new Worker(workerScript);
     i32a2 = new Int32Array(sab, 4);
-    worker3.postMessage({sab: sab, offset: 8}, [sab]);
+    worker3.postMessage({sab: sab, offset: 8});
 
     // Spin until the worker is waiting on the futex.
     while (%AtomicsNumWaitersForTesting(i32a2, 1) != 1) {}
@@ -190,7 +190,7 @@ if (this.Worker) {
     var workers = [];
     for (id = 0; id < 4; id++) {
       workers[id] = new Worker(workerScript);
-      workers[id].postMessage({sab: sab, id: id}, [sab]);
+      workers[id].postMessage({sab: sab, id: id});
     }
 
     // Spin until all workers are waiting on the futex.