Close all windows when app shim quits.

apps/app_shim/app_shim_handler_mac.h

 // Copyright 2013 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.
 
 #ifndef APPS_APP_SHIM_APP_SHIM_HANDLER_MAC_H_
 #define APPS_APP_SHIM_APP_SHIM_HANDLER_MAC_H_
 
 #include <string>
 
 class Profile;
@@ skipping 37 matching lines @@
   // must return true if successful, or false to indicate back to the shim
   // process that it should close.
   virtual bool OnShimLaunch(Host* host) = 0;
 
   // Invoked by the shim host when the connection to the shim process is closed.
   virtual void OnShimClose(Host* host) = 0;
 
   // Invoked by the shim host when the shim process receives a focus event.
   virtual void OnShimFocus(Host* host) = 0;
 
+  // Invoked by the shim host when the shim process receives a quit event.
+  virtual void OnShimQuit(Host* host) = 0;
+
  protected:
   AppShimHandler() {}
   virtual ~AppShimHandler() {}
 };
 
 }  // namespace apps
 
 #endif  // APPS_APP_SHIM_APP_SHIM_HANDLER_MAC_H_