Rely on losing focus, not on becoming unfullscreened, to destroy a fullscreen window.

content/browser/renderer_host/render_widget_host_view_gtk.h

Index: content/browser/renderer_host/render_widget_host_view_gtk.h
diff --git a/content/browser/renderer_host/render_widget_host_view_gtk.h b/content/browser/renderer_host/render_widget_host_view_gtk.h
index d727d33810a8ceb2abbfecb9d2e6e1738f7fcd8d..aa1b0ac596ae7d9847da2d84ab840f6f1a00dc0f 100644
--- a/content/browser/renderer_host/render_widget_host_view_gtk.h
+++ b/content/browser/renderer_host/render_widget_host_view_gtk.h
@@ -21,6 +21,7 @@
 #include "ui/base/gtk/gtk_signal.h"
 #include "ui/base/gtk/gtk_signal_registrar.h"
 #include "ui/base/gtk/owned_widget_gtk.h"
+#include "ui/base/x/active_window_watcher_x_observer.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/point.h"
 #include "ui/gfx/rect.h"
@@ -45,7 +46,8 @@ typedef struct _GtkSelectionData GtkSelectionData;
 // -----------------------------------------------------------------------------
 class CONTENT_EXPORT RenderWidgetHostViewGtk
     : public content::RenderWidgetHostViewBase,
-      public BrowserAccessibilityDelegate {
+      public BrowserAccessibilityDelegate,
+      public ui::ActiveWindowWatcherXObserver {
  public:
   virtual ~RenderWidgetHostViewGtk();
 
@@ -127,6 +129,9 @@ class CONTENT_EXPORT RenderWidgetHostViewGtk
       const std::vector<AccessibilityHostMsg_NotificationParams>& params)
       OVERRIDE;
 
+  // ActiveWindowWatcherXObserver implementation.
+  virtual void ActiveWindowChanged(GdkWindow *active_window) OVERRIDE;

[Daniel Erat, 2012/06/19 13:53:14]

nit: move asterisk to left side of space

+
   // If the widget is aligned with an edge of the monitor its on and the user
   // attempts to drag past that edge we track the number of times it has
   // occurred, so that we can force the widget to scroll when it otherwise
@@ -172,11 +177,6 @@ class CONTENT_EXPORT RenderWidgetHostViewGtk
  private:
   friend class RenderWidgetHostViewGtkWidget;
 
-  CHROMEGTK_CALLBACK_1(RenderWidgetHostViewGtk,
-                       gboolean,
-                       OnWindowStateEvent,
-                       GdkEventWindowState*);
-
   CHROMEGTK_CALLBACK_0(RenderWidgetHostViewGtk,
                        void,
                        OnDestroy);
@@ -256,6 +256,10 @@ class CONTENT_EXPORT RenderWidgetHostViewGtk
   // Is the widget fullscreen?
   bool is_fullscreen_;
 
+  // Has the window ever been marked active? Only valid for fullscreen or
+  // popup windows.
+  bool made_active_;
+
   // Used to record the last position of the mouse.
   // While the mouse is locked, they store the last known position just as mouse
   // lock was entered.