Virtual destructors should have virtual keyword.

skia/ext/vector_platform_device_skia.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 SKIA_EXT_VECTOR_PLATFORM_DEVICE_SKIA_H_
 #define SKIA_EXT_VECTOR_PLATFORM_DEVICE_SKIA_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/logging.h"
@@ skipping 16 matching lines @@
   virtual SkDevice* newDevice(SkCanvas* notUsed, SkBitmap::Config config,
                               int width, int height, bool isOpaque,
                               bool isForLayer);
  private:
   SkPDFDeviceFactory factory_;
 };
 
 class VectorPlatformDeviceSkia : public PlatformDevice {
  public:
   SK_API VectorPlatformDeviceSkia(SkPDFDevice* pdf_device);
-  ~VectorPlatformDeviceSkia();
+  virtual ~VectorPlatformDeviceSkia();
 
   SkPDFDevice* PdfDevice() { return pdf_device_.get(); }
 
   // PlatformDevice methods.
   virtual bool IsVectorial();
   virtual bool IsNativeFontRenderingAllowed();
 
   virtual PlatformSurface BeginPlatformPaint();
   virtual void EndPlatformPaint();
 
@@ skipping 46 matching lines @@
  private:
   SkRefPtr<SkPDFDevice> pdf_device_;
   SkRefPtr<BitmapPlatformDevice> raster_surface_;
 
   DISALLOW_COPY_AND_ASSIGN(VectorPlatformDeviceSkia);
 };
 
 }  // namespace skia
 
 #endif  // SKIA_EXT_VECTOR_PLATFORM_DEVICE_SKIA_H_