Add the "virtual" keyword on method overrides that are missing it.

webkit/glue/plugins/pepper_font.h

 // Copyright (c) 2010 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 WEBKIT_GLUE_PLUGINS_PEPPER_FONT_H_
 #define WEBKIT_GLUE_PLUGINS_PEPPER_FONT_H_
 
 #include "base/scoped_ptr.h"
 #include "ppapi/c/dev/ppb_font_dev.h"
 #include "webkit/glue/plugins/pepper_resource.h"
 
 namespace WebKit {
 class WebFont;
 }
 
 namespace pepper {
 
 class PluginInstance;
 
 class Font : public Resource {
  public:
   Font(PluginModule* module, const PP_FontDescription_Dev& desc);
   virtual ~Font();
 
   // Returns a pointer to the interface implementing PPB_Font that is exposed to
   // the plugin.
   static const PPB_Font_Dev* GetInterface();
 
   // Resource overrides.
-  Font* AsFont() { return this; }
+  virtual Font* AsFont();
 
   // PPB_Font implementation.
   bool Describe(PP_FontDescription_Dev* description,
                 PP_FontMetrics_Dev* metrics);
   bool DrawTextAt(PP_Resource image_data,
                   const PP_TextRun_Dev* text,
                   const PP_Point* position,
                   uint32_t color,
                   const PP_Rect* clip,
                   bool image_data_is_opaque);
   int32_t MeasureText(const PP_TextRun_Dev* text);
   uint32_t CharacterOffsetForPixel(const PP_TextRun_Dev* text,
                                    int32_t pixel_position);
   int32_t PixelOffsetForCharacter(const PP_TextRun_Dev* text,
                                   uint32_t char_offset);
 
  private:
   scoped_ptr<WebKit::WebFont> font_;
 };
 
 }  // namespace pepper
 
 #endif  // WEBKIT_GLUE_PLUGINS_PEPPER_FONT_H_