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"
 #include "chrome/browser/extensions/extension_function.h"
 #include "chrome/common/extensions/api/page_capture.h"
 #include "webkit/blob/shareable_file_reference.h"
 
 class FilePath;
 
 namespace content {
 class WebContents;
 }
 
 namespace extensions {
 
 class PageCaptureSaveAsMHTMLFunction : public AsyncExtensionFunction {
  public:
   PageCaptureSaveAsMHTMLFunction();
 
   // Test specific delegate used to test that the temporary file gets deleted.
   class TestDelegate {
    public:
+    virtual ~TestDelegate() { }
+
     // 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;
   };
   static void SetTestDelegate(TestDelegate* delegate);
 
  private:
   virtual ~PageCaptureSaveAsMHTMLFunction();
   virtual bool RunImpl() OVERRIDE;
   virtual bool OnMessageReceivedFromRenderView(
@@ skipping 20 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_