Users stuck in fullscreen mode when running gnome-shell.

chrome/browser/ui/gtk/browser_window_gtk.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/gtk/browser_window_gtk.h"
 
 #include <dlfcn.h>
 #include <gdk/gdkkeysyms.h>
 
 #include <algorithm>
@@ skipping 410 matching lines @@
     gtk_window_set_role(window_, "browser");
     SetGeometryHints();
     InitWidgets();
   }
 
   ConnectAccelerators();
 
   // 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,
                                                GdkEventExpose* event) {
   TRACE_EVENT0("ui::gtk", "BrowserWindowGtk::OnCustomFrameExpose");
 
   // Draw the default background.
   cairo_t* cr = gdk_cairo_create(gtk_widget_get_window(widget));
   gdk_cairo_rectangle(cr, &event->area);
   cairo_clip(cr);
@@ skipping 2145 matching lines @@
           wm_type == ui::WM_OPENBOX ||
           wm_type == ui::WM_XFWM4);
 }
 
 // static
 BrowserWindow* BrowserWindow::CreateBrowserWindow(Browser* browser) {
   BrowserWindowGtk* browser_window_gtk = new BrowserWindowGtk(browser);
   browser_window_gtk->Init();
   return browser_window_gtk;
 }