Users stuck in fullscreen mode when running gnome-shell.

ui/base/x/x11_util.cc

Index: ui/base/x/x11_util.cc
diff --git a/ui/base/x/x11_util.cc b/ui/base/x/x11_util.cc
index a7b1bc3ad03f90df43e283ef900142c6d04f0512..357e135eebee39c5023ae47572996ec0c39d975f 100644
--- a/ui/base/x/x11_util.cc
+++ b/ui/base/x/x11_util.cc
@@ -467,6 +467,18 @@ GtkWindow* GetGtkWindowFromX11Window(XID xid) {
 void* GetVisualFromGtkWidget(GtkWidget* widget) {
   return GDK_VISUAL_XVISUAL(gtk_widget_get_visual(widget));
 }
+
+void SetHideTitlebarWhenMaximizedProperty(GdkWindow* window) {
+  uint32 hide = 1;
+  XChangeProperty(GetXDisplay(),
+      GDK_WINDOW_XID(window),
+      GetAtom("_GTK_HIDE_TITLEBAR_WHEN_MAXIMIZED"),
+      XA_CARDINAL,
+      32,  // size in bits
+      PropModeReplace,
+      reinterpret_cast<unsigned char*>(&hide),
+      1);
+}
 #endif  // defined(TOOLKIT_GTK)
 
 int BitsPerPixelForPixmapDepth(Display* dpy, int depth) {