[bindings] Use |PostMessage| attribute for DedicatedWorkerGlobalScope.postMessage to eliminate cust…

LayoutTests/fast/workers/worker-context-multi-port-expected.txt

Index: LayoutTests/fast/workers/worker-context-multi-port-expected.txt
diff --git a/LayoutTests/fast/workers/worker-context-multi-port-expected.txt b/LayoutTests/fast/workers/worker-context-multi-port-expected.txt
index 04fe8981b5ff656a74dfda6be8b69a5f5d5afb83..722eba571f15f09fac410a03c76a73d87834b60d 100644
--- a/LayoutTests/fast/workers/worker-context-multi-port-expected.txt
+++ b/LayoutTests/fast/workers/worker-context-multi-port-expected.txt
@@ -9,11 +9,11 @@ TEST COMPLETE
 PASS event.ports is non-null and zero length when no port sent
 PASS event.ports is non-null and zero length when empty array sent
 PASS event.ports contains two ports when two ports sent
-PASS posting a null port did throw: TypeError: Failed to execute 'postMessage' on 'WorkerGlobalScope': Value at index 1 is an untransferable 'null' value.
-PASS posting a non-port did throw: TypeError: Failed to execute 'postMessage' on 'WorkerGlobalScope': Value at index 1 does not have a transferable type.
+PASS posting a null port did throw: TypeError: Failed to execute 'postMessage' on 'DedicatedWorkerGlobalScope': Value at index 1 is an untransferable 'null' value.
+PASS posting a non-port did throw: TypeError: Failed to execute 'postMessage' on 'DedicatedWorkerGlobalScope': Value at index 1 does not have a transferable type.
 PASS event.ports contains two ports when two ports re-sent after error
-PASS posting a non-array did throw: TypeError: Failed to execute 'postMessage' on 'WorkerGlobalScope': The 2nd argument is neither an array, nor does it have indexed properties.
-PASS posting a non-sequence did throw: TypeError: Failed to execute 'postMessage' on 'WorkerGlobalScope': Value at index 0 does not have a transferable type.
+PASS posting a non-array did throw: TypeError: Failed to execute 'postMessage' on 'DedicatedWorkerGlobalScope': The 2nd argument is neither an array, nor does it have indexed properties.
+PASS posting a non-sequence did throw: TypeError: Failed to execute 'postMessage' on 'DedicatedWorkerGlobalScope': Value at index 0 does not have a transferable type.
 
 TEST COMPLETE