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

webkit/glue/plugins/pepper_directory_reader.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_directory_reader.h"
 
 #include "base/logging.h"
 #include "base/utf_string_conversions.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_errors.h"
@@ skipping 71 matching lines @@
       entry_(NULL) {
 }
 
 DirectoryReader::~DirectoryReader() {
 }
 
 const PPB_DirectoryReader_Dev* DirectoryReader::GetInterface() {
   return &ppb_directoryreader;
 }
 
+DirectoryReader* DirectoryReader::AsDirectoryReader() {
+  return this;
+}
+
 int32_t DirectoryReader::GetNextEntry(PP_DirectoryEntry_Dev* entry,
                                       PP_CompletionCallback callback) {
   if (directory_ref_->GetFileSystemType() == PP_FILESYSTEMTYPE_EXTERNAL)
     return PP_ERROR_FAILED;
 
   entry_ = entry;
   if (FillUpEntry()) {
     entry_ = NULL;
     return PP_OK;
   }
@@ skipping 45 matching lines @@
 
   if (!has_more_) {
     entry_->file_ref = 0;
     return true;
   }
 
   return false;
 }
 
 }  // namespace pepper