Close notification windows while message loop is still active

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index 0d30ef1ea8354ed63b16105f2e57da480af6c0c5..dee0233d0a4aabce2c954c48df08eebf1b0db6c7 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -489,6 +489,9 @@ class DummySystemTrayDelegate : public SystemTrayDelegate {
   virtual void ChangeProxySettings() OVERRIDE {
   }
 
+  virtual void OnTrayDestroyed() OVERRIDE {
+  }
+
   bool muted_;
   bool wifi_enabled_;
   bool cellular_enabled_;
@@ -589,6 +592,7 @@ Shell::~Shell() {
   window_cycle_controller_.reset();
   event_client_.reset();
   monitor_controller_.reset();
+  tooltip_controller_.reset();
 
   // Launcher widget has a InputMethodBridge that references to
   // input_method_filter_'s input_method_. So explicitly release launcher_