Check for duplicate ArrayBuffer transferables.

LayoutTests/fast/canvas/webgl/script-tests/arraybuffer-transfer-of-control.js

 window.jsTestIsAsync = true;
 
 description('Test transfer of control semantics for ArrayBuffers.');
 window.testsComplete = 0;
 
 var arraySize = 40;
 var arrayOffset = 8;
 var arrayEffectiveSize = arraySize - arrayOffset;
 
 var basicBufferTypes =
@@ skipping 310 matching lines @@
             if (view.buffer !== e.data[0].buffer) {
                 testFailed(name + ": not every view pointed to the correct buffer.");
                 return false;
             }
         }
         return true;
     }
 }, {
     name: "transfer list multiple",
     send: function(name) {
+        var buffer0 = createBuffer(arraySize);
+        wrapFailSend(name, { buffer : buffer0 }, [buffer0, buffer0]);
         var buffer = createBuffer(arraySize);
-        wrapSend(name, { buffer : buffer }, [buffer,buffer]);
+        wrapSend(name, { buffer : buffer }, [buffer]);
         assertBufferClosed(name, buffer);
         wrapFailSend(name, [buffer], [buffer]);
         wrapFailSend(name, [], [buffer]);
         var buffer2 = createBuffer(arraySize);
         wrapFailSend(name, [], [buffer2, buffer]);
         checkBuffer(name, buffer2, arraySize);
         wrapFailSend(name, [], [buffer, buffer2]);
         checkBuffer(name, buffer2, arraySize);
         wrapFailSend(name, [buffer2], [buffer2, buffer]);
         checkBuffer(name, buffer2, arraySize);
@@ skipping 113 matching lines @@
     }
     doneTest();
 }
 
 window.addEventListener('message', windowHandleMessage);
 window.testsComplete = -1;
 doneTest();
 
 successfullyParsed = true;