Revert "Roll IDL to multivm@910"

third_party/WebCore/workers/Worker.idl

Index: third_party/WebCore/workers/Worker.idl
diff --git a/third_party/WebCore/workers/Worker.idl b/third_party/WebCore/workers/Worker.idl
index 3665af6b082a8ee1e543df3753bee7248d514080..083353c046128378b3a90baa4a29efa733a0d65d 100644
--- a/third_party/WebCore/workers/Worker.idl
+++ b/third_party/WebCore/workers/Worker.idl
@@ -43,12 +43,8 @@ module threads {
 #if defined(LANGUAGE_JAVASCRIPT) && LANGUAGE_JAVASCRIPT
         [Custom] void postMessage(in SerializedScriptValue message, in [Optional] Array messagePorts)
             raises(DOMException);
-
-#if defined(ENABLE_LEGACY_VENDOR_PREFIXES) && ENABLE_LEGACY_VENDOR_PREFIXES
         [Custom] void webkitPostMessage(in SerializedScriptValue message, in [Optional] Array messagePorts)
             raises(DOMException);
-#endif // defined(ENABLE_LEGACY_VENDOR_PREFIXES) && ENABLE_LEGACY_VENDOR_PREFIXES
-
 #else
         // There's no good way to expose an array via the ObjC bindings, so for now just allow passing in a single port.
         void postMessage(in SerializedScriptValue message, in [Optional] MessagePort messagePort)