Virtual destructors should have virtual keyword.

remoting/host/capturer_fake_ascii.h

 // Copyright (c) 2011 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 REMOTING_HOST_CAPTURER_FAKE_ASCII_H_
 #define REMOTING_HOST_CAPTURER_FAKE_ASCII_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "remoting/host/capturer.h"
 #include "remoting/host/capturer_helper.h"
 
 namespace remoting {
 
 // A CapturerFakeAscii always outputs an image of 64x48 ASCII characters.
 // This image is artificially generated for testing purpose.
 //
 // CapturerFakeAscii is doubled buffered as required by Capturer. See
 // remoting/host/capturer.h.
 class CapturerFakeAscii : public Capturer {
  public:
   CapturerFakeAscii();
-  ~CapturerFakeAscii();
+  virtual ~CapturerFakeAscii();
 
   // Capturer interface.
   virtual void ScreenConfigurationChanged();
   virtual media::VideoFrame::Format pixel_format() const;
   virtual void ClearInvalidRects();
   virtual void InvalidateRects(const InvalidRects& inval_rects);
   virtual void InvalidateScreen(const gfx::Size& size);
   virtual void InvalidateFullScreen();
   virtual void CaptureInvalidRects(CaptureCompletedCallback* callback);
   virtual const gfx::Size& size_most_recent() const;
@@ skipping 18 matching lines @@
 
   // Format of pixels returned in buffer.
   media::VideoFrame::Format pixel_format_;
 
   DISALLOW_COPY_AND_ASSIGN(CapturerFakeAscii);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_CAPTURER_FAKE_ASCII_H_