mojo: handle WM_DELETE_WINDOW in native_viewport_x11

mojo/services/native_viewport/native_viewport_x11.cc

Index: mojo/services/native_viewport/native_viewport_x11.cc
diff --git a/mojo/services/native_viewport/native_viewport_x11.cc b/mojo/services/native_viewport/native_viewport_x11.cc
index 9903523525880d58a95adae67aae95044edf1517..b3db2e8682e9cc2e988bf0c7907560cdd85b43fa 100644
--- a/mojo/services/native_viewport/native_viewport_x11.cc
+++ b/mojo/services/native_viewport/native_viewport_x11.cc
@@ -120,7 +120,7 @@ class NativeViewportX11 : public NativeViewport,
       case MotionNotify:
         return true;
       case ClientMessage:
-        return event->xclient.message_type != atom_wm_protocols_;
+        return event->xclient.message_type == atom_wm_protocols_;
       default:
         return false;
     }