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

webkit/glue/plugins/pepper_file_io.cc

 // 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.
 
 #include "webkit/glue/plugins/pepper_file_io.h"
 
 #include "base/callback.h"
 #include "base/file_util.h"
 #include "base/file_util_proxy.h"
 #include "base/message_loop_proxy.h"
@@ skipping 192 matching lines @@
 // static
 const PPB_FileIO_Dev* FileIO::GetInterface() {
   return &ppb_fileio;
 }
 
 // static
 const PPB_FileIOTrusted_Dev* FileIO::GetTrustedInterface() {
   return &ppb_fileiotrusted;
 }
 
+FileIO* FileIO::AsFileIO() {
+  return this;
+}
+
 int32_t FileIO::Open(FileRef* file_ref,
                      int32_t open_flags,
                      PP_CompletionCallback callback) {
   if (file_ != base::kInvalidPlatformFileValue)
     return PP_ERROR_FAILED;
 
   DCHECK(!callback_.func);
   callback_ = callback;
 
   int flags = 0;
@@ skipping 201 matching lines @@
 
 void FileIO::ReadWriteCallback(base::PlatformFileError error_code,
                                int bytes_read_or_written) {
   if (error_code != base::PLATFORM_FILE_OK)
     RunPendingCallback(PlatformFileErrorToPepperError(error_code));
   else
     RunPendingCallback(bytes_read_or_written);
 }
 
 }  // namespace pepper