GTTF: Add missing virtual destructors.

content/browser/download/download_item_impl.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_ITEM_IMPL_H_
 #define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_ITEM_IMPL_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 14 matching lines @@
 #include "net/base/net_errors.h"
 #include "net/base/net_log.h"
 
 namespace content {
 class DownloadFile;
 class DownloadItemImplDelegate;
 
 // See download_item.h for usage.
 class CONTENT_EXPORT DownloadItemImpl
     : public DownloadItem,
-      public DownloadDestinationObserver {
+      public NON_EXPORTED_BASE(DownloadDestinationObserver) {
  public:
   enum ResumeMode {
     RESUME_MODE_INVALID = 0,
     RESUME_MODE_IMMEDIATE_CONTINUE,
     RESUME_MODE_IMMEDIATE_RESTART,
     RESUME_MODE_USER_CONTINUE,
     RESUME_MODE_USER_RESTART
   };
 
   // The maximum number of attempts we will make to resume automatically.
@@ skipping 435 matching lines @@
   const net::BoundNetLog bound_net_log_;
 
   base::WeakPtrFactory<DownloadItemImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadItemImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_ITEM_IMPL_H_