Abstract fullscreen exit bubble logic to bring Linux's behaviour in line with

chrome/browser/ui/gtk/browser_window_gtk.cc

 // Copyright (c) 2011 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 <gdk/gdkkeysyms.h>
 
 #include <dlfcn.h>
 #include <string>
@@ skipping 1443 matching lines @@
   if (event->changed_mask & GDK_WINDOW_STATE_FULLSCREEN) {
     browser_->WindowFullscreenStateChanged();
     if (state_ & GDK_WINDOW_STATE_FULLSCREEN) {
       UpdateCustomFrame();
       toolbar_->Hide();
       tabstrip_->Hide();
       bool is_kiosk =
           CommandLine::ForCurrentProcess()->HasSwitch(switches::kKioskMode);
       if (!is_kiosk) {
         fullscreen_exit_bubble_.reset(new FullscreenExitBubbleGtk(
-            GTK_FLOATING_CONTAINER(render_area_floating_container_)));
+            GTK_FLOATING_CONTAINER(render_area_floating_container_),
+            browser()));
       }
       gtk_widget_hide(toolbar_border_);
     } else {
       fullscreen_exit_bubble_.reset();
       UpdateCustomFrame();
       ShowSupportedWindowFeatures();
     }
   }
 
   titlebar_->UpdateCustomFrame(UseCustomFrame() && !IsFullscreen());
@@ skipping 915 matching lines @@
   // are taken from the WMs' source code.
   return (wm_name == "Blackbox" ||
           wm_name == "compiz" ||
           wm_name == "Compiz" ||
           wm_name == "e16" ||  // Enlightenment DR16
           wm_name == "Metacity" ||
           wm_name == "Mutter" ||
           wm_name == "Openbox" ||
           wm_name == "Xfwm4");
 }