chore: remove unsupported skiptaskbar linux impl (#35179)

chore: unsupported skiptaskbar linux impl

shell/browser/native_window_views.cc

@@ -1040,10 +1040,6 @@ void NativeWindowViews::SetSkipTaskbar(bool skip) {
     taskbar->AddTab(GetAcceleratedWidget());
     taskbar_host_.RestoreThumbarButtons(GetAcceleratedWidget());
   }
-#elif defined(USE_OZONE_PLATFORM_X11)
-  if (IsX11())
-    SetWMSpecState(static_cast<x11::Window>(GetAcceleratedWidget()), skip,
-                   x11::GetAtom("_NET_WM_STATE_SKIP_TASKBAR"));
 #endif
 }