Initialize nsKeyEvent::mNativeKeyEvent to prevent crashes on multi-process (bug 906237, r=smichaud).

widget/nsGUIEventIPC.h

@@ -273,9 +273,10 @@ struct ParamTraits<nsKeyEvent>
         ReadParam(aMsg, aIter, &aResult->keyCode) &&
         ReadParam(aMsg, aIter, &aResult->charCode) &&
         ReadParam(aMsg, aIter, &aResult->isChar) &&
-        ReadParam(aMsg, aIter, &aResult->location)) {
-      aResult->mKeyNameIndex =
-        static_cast<mozilla::widget::KeyNameIndex>(keyNameIndex);
+        ReadParam(aMsg, aIter, &aResult->location))
+    {
+      aResult->mKeyNameIndex = static_cast<mozilla::widget::KeyNameIndex>(keyNameIndex);
+      aResult->mNativeKeyEvent = NULL;
       return true;
     }
     return false;