Cleanup: Remove unneeded forward declarations in ppapi.

ppapi/c/private/ppb_flash_file.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 PPAPI_C_PRIVATE_PPB_FLASH_FILE_H_
 #define PPAPI_C_PRIVATE_PPB_FLASH_FILE_H_
 
 #ifdef _WIN32
 #include <windows.h>
 #endif
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_resource.h"
 
 #ifdef _WIN32
 typedef HANDLE PP_FileHandle;
 static const PP_FileHandle PP_kInvalidFileHandle = NULL;
 #else
 typedef int PP_FileHandle;
 static const PP_FileHandle PP_kInvalidFileHandle = -1;
 #endif
 
-struct PP_CompletionCallback;
-struct PP_FontDescription_Dev;
 struct PP_FileInfo;
 
 struct PP_DirEntry_Dev {
   const char* name;
   PP_Bool is_dir;
 };
 
 struct PP_DirContents_Dev {
   int32_t count;
   struct PP_DirEntry_Dev* entries;
@@ skipping 77 matching lines @@
   // (except in taking FileRefs instead of paths, of course). We omit the
   // functionality which we do not provide for FileRefs.
   int32_t (*OpenFile)(PP_Resource file_ref_id,
                       int32_t mode,
                       PP_FileHandle* file);
   int32_t (*QueryFile)(PP_Resource file_ref_id,
                        struct PP_FileInfo* info);
 };
 
 #endif  // PPAPI_C_PRIVATE_PPB_FLASH_FILE_H_