WIP: Migrate generated bindings to new ExceptionState constructor.

Source/bindings/v8/custom/V8MessagePortCustom.cpp

Index: Source/bindings/v8/custom/V8MessagePortCustom.cpp
diff --git a/Source/bindings/v8/custom/V8MessagePortCustom.cpp b/Source/bindings/v8/custom/V8MessagePortCustom.cpp
index c35b1d86beb2617164ce576d04c3ed01d9bfbfbc..f8eb9df2abdcfe5bbfb05a53b8a648c7aaec5d4d 100644
--- a/Source/bindings/v8/custom/V8MessagePortCustom.cpp
+++ b/Source/bindings/v8/custom/V8MessagePortCustom.cpp
@@ -43,6 +43,7 @@ namespace WebCore {
 
 void V8MessagePort::postMessageMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
+    ExceptionState exceptionState(ExceptionState::ExecutionContext, "postMessage", "MessagePort", info.Holder(), info.GetIsolate());
     MessagePort* messagePort = V8MessagePort::toNative(info.Holder());
     MessagePortArray portArray;
     ArrayBufferArray arrayBufferArray;
@@ -50,8 +51,10 @@ void V8MessagePort::postMessageMethodCustom(const v8::FunctionCallbackInfo<v8::V
         bool notASequence = false;
         const int transferablesArgIndex = 1;
         if (!extractTransferables(info[transferablesArgIndex], portArray, arrayBufferArray, notASequence, info.GetIsolate())) {
-            if (notASequence)
-                throwTypeError(ExceptionMessages::failedToExecute("postMessage", "MessagePort", ExceptionMessages::notAnArrayTypeArgumentOrValue(transferablesArgIndex + 1)), info.GetIsolate());
+            if (notASequence) {
+                exceptionState.throwTypeError(ExceptionMessages::notAnArrayTypeArgumentOrValue(transferablesArgIndex + 1));
+                exceptionState.throwIfNeeded();
+            }
             return;
         }
     }
@@ -59,7 +62,6 @@ void V8MessagePort::postMessageMethodCustom(const v8::FunctionCallbackInfo<v8::V
     RefPtr<SerializedScriptValue> message = SerializedScriptValue::create(info[0], &portArray, &arrayBufferArray, didThrow, info.GetIsolate());
     if (didThrow)
         return;
-    ExceptionState exceptionState(info.Holder(), info.GetIsolate());
     messagePort->postMessage(message.release(), &portArray, exceptionState);
     exceptionState.throwIfNeeded();
 }