aura: Close fullscreen RenderWidgetHostViewAura on blur.

content/browser/renderer_host/render_widget_host_view_aura.h

Index: content/browser/renderer_host/render_widget_host_view_aura.h
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.h b/content/browser/renderer_host/render_widget_host_view_aura.h
index fae4e13078a184800e22082dacf1093438c83bff..e6b23d2601adb2984cd49c40262ff6e2a0d8302f 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.h
+++ b/content/browser/renderer_host/render_widget_host_view_aura.h
@@ -225,6 +225,11 @@ class RenderWidgetHostViewAura
 
   scoped_ptr<WindowObserver> window_observer_;
 
+  // Are we in the process of closing?  Tracked so fullscreen views can avoid
+  // sending a second shutdown request to the host when they lose the focus
+  // after requesting shutdown for another reason (e.g. Escape key).
+  bool in_shutdown_;
+
   // Is this a fullscreen view?
   bool is_fullscreen_;