Users stuck in fullscreen mode when running gnome-shell.

chrome/browser/ui/gtk/browser_window_gtk.cc

Index: chrome/browser/ui/gtk/browser_window_gtk.cc
diff --git a/chrome/browser/ui/gtk/browser_window_gtk.cc b/chrome/browser/ui/gtk/browser_window_gtk.cc
index 85ba20ee72c0ceb139661f9b3350d5c9973b5b79..99b98f94ed5bf4e5f7001c15d69bff719dc89a06 100644
--- a/chrome/browser/ui/gtk/browser_window_gtk.cc
+++ b/chrome/browser/ui/gtk/browser_window_gtk.cc
@@ -428,6 +428,11 @@ void BrowserWindowGtk::Init() {
   // Set the initial background color of widgets.
   SetBackgroundColor();
   HideUnsupportedWindowFeatures();
+
+  // Setting _GTK_HIDE_TITLEBAR_WHEN_MAXIMIZED tells gnome-shell to not force
+  // fullscreen on the window when it matches the desktop size.
+  ui::SetHideTitlebarWhenMaximizedProperty(
+      ui::GetX11WindowFromGtkWidget(GTK_WIDGET(window_)));
 }
 
 gboolean BrowserWindowGtk::OnCustomFrameExpose(GtkWidget* widget,