Cleanup: Remove unneeded forward declarations in ppapi.

ppapi/cpp/dev/font_dev.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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 PPAPI_CPP_DEV_FONT_DEV_H_
 #define PPAPI_CPP_DEV_FONT_DEV_H_
 
 #include <string>
 
 #include "ppapi/c/dev/ppb_font_dev.h"
 #include "ppapi/cpp/resource.h"
 #include "ppapi/cpp/var.h"
 
 struct PP_FontDescription_Dev;
 
 namespace pp {
 
-class Font_dev;
 class ImageData;
 class Instance;
 class Point;
 class Rect;
 
 // FontDescription_Dev ---------------------------------------------------------
 
 class FontDescription_Dev {
  public:
   FontDescription_Dev();
@@ skipping 103 matching lines @@
                       uint32_t color,
                       bool image_data_is_opaque = false) const;
 
   // Convenience function that assumes a left-to-right string.
   int32_t MeasureSimpleText(const std::string& text) const;
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_DEV_FONT_DEV_H_