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

test/mjsunit/d8-worker-sharedarraybuffer.js

Index: test/mjsunit/d8-worker-sharedarraybuffer.js
diff --git a/test/mjsunit/d8-worker-sharedarraybuffer.js b/test/mjsunit/d8-worker-sharedarraybuffer.js
index 3fe9fdd143b1eab5eabe85ff57dcf908e524a39f..09586c3a11c7bcebb3d8aca5e41680784c528b3e 100644
--- a/test/mjsunit/d8-worker-sharedarraybuffer.js
+++ b/test/mjsunit/d8-worker-sharedarraybuffer.js
@@ -28,20 +28,19 @@
 // Flags: --harmony-sharedarraybuffer
 
 if (this.Worker) {
-
   (function TestTransfer() {
     var workerScript =
       `onmessage = function(m) {
-       var sab = m;
-       var ta = new Uint32Array(sab);
-       if (sab.byteLength !== 16) {
-         throw new Error('SharedArrayBuffer transfer byteLength');
-       }
-       for (var i = 0; i < 4; ++i) {
-         if (ta[i] !== i) {
-           throw new Error('SharedArrayBuffer transfer value ' + i);
-         }
-       }
+        var sab = m;
+        var ta = new Uint32Array(sab);
+        if (sab.byteLength !== 16) {
+          throw new Error('SharedArrayBuffer transfer byteLength');
+        }
+        for (var i = 0; i < 4; ++i) {
+          if (ta[i] !== i) {
+            throw new Error('SharedArrayBuffer transfer value ' + i);
+          }
+        }
         // Atomically update ta[0]
         Atomics.store(ta, 0, 100);
       };`;
@@ -55,7 +54,7 @@ if (this.Worker) {
     }
 
     // Transfer SharedArrayBuffer
-    w.postMessage(sab, [sab]);
+    w.postMessage(sab);
     assertEquals(16, sab.byteLength);  // ArrayBuffer should not be neutered.
 
     // Spinwait for the worker to update ta[0]
@@ -86,7 +85,7 @@ 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});
     }
 
     // Spinwait for each worker to update ta[id]