Move guest lifetime management to chrome

chrome/browser/guest_view/guest_view.h

 // Copyright 2014 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 CHROME_BROWSER_GUEST_VIEW_GUEST_VIEW_H_
 #define CHROME_BROWSER_GUEST_VIEW_GUEST_VIEW_H_
 
 #include "chrome/browser/guest_view/guest_view_base.h"
 
 template <typename T>
@@ skipping 28 matching lines @@
     return T::Type;
   }
 
  protected:
   GuestView(int guest_instance_id,
             content::WebContents* guest_web_contents,
             const std::string& embedder_extension_id)
       : GuestViewBase(guest_instance_id,
                       guest_web_contents,
                       embedder_extension_id) {}
+  virtual ~GuestView() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(GuestView);
 };
 
 #endif  // CHROME_BROWSER_GUEST_VIEW_GUEST_VIEW_H_