GTTF: Add missing virtual destructors.

chrome/browser/extensions/api/page_capture/page_capture_api.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 CHROME_BROWSER_EXTENSIONS_API_PAGE_CAPTURE_PAGE_CAPTURE_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_PAGE_CAPTURE_PAGE_CAPTURE_API_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
@@ skipping 12 matching lines @@
 class PageCaptureSaveAsMHTMLFunction : public AsyncExtensionFunction {
  public:
   PageCaptureSaveAsMHTMLFunction();
 
   // Test specific delegate used to test that the temporary file gets deleted.
   class TestDelegate {
    public:
     // Called on the UI thread when the temporary file that contains the
     // generated data has been created.
     virtual void OnTemporaryFileCreated(const FilePath& temp_file) = 0;
+
+   protected:
+    virtual ~TestDelegate() { }
   };
   static void SetTestDelegate(TestDelegate* delegate);
 
  private:
   virtual ~PageCaptureSaveAsMHTMLFunction();
   virtual bool RunImpl() OVERRIDE;
   virtual bool OnMessageReceivedFromRenderView(
       const IPC::Message& message) OVERRIDE;
 
   // Called on the file thread.
@@ skipping 17 matching lines @@
 
   // The file containing the MHTML.
   scoped_refptr<webkit_blob::ShareableFileReference> mhtml_file_;
 
   DECLARE_EXTENSION_FUNCTION("pageCapture.saveAsMHTML", PAGECAPTURE_SAVEASMHTML)
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_PAGE_CAPTURE_PAGE_CAPTURE_API_H_