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

webkit/glue/plugins/pepper_file_ref.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_ref.h"
 
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "ppapi/c/pp_errors.h"
 #include "webkit/glue/plugins/pepper_common.h"
@@ skipping 247 matching lines @@
 }
 
 FileRef::~FileRef() {
 }
 
 // static
 const PPB_FileRef_Dev* FileRef::GetInterface() {
   return &ppb_fileref;
 }
 
+FileRef* FileRef::AsFileRef() {
+  return this;
+}
+
 std::string FileRef::GetName() const {
   if (GetFileSystemType() == PP_FILESYSTEMTYPE_EXTERNAL) {
     FilePath::StringType path = system_path_.value();
     size_t pos = path.rfind(FilePath::kSeparators[0]);
     DCHECK(pos != FilePath::StringType::npos);
 #if defined(OS_WIN)
     return WideToUTF8(path.substr(pos + 1));
 #elif defined(OS_POSIX)
     return path.substr(pos + 1);
 #else
@@ skipping 56 matching lines @@
 #elif defined(OS_POSIX)
       virtual_path_.substr(1)
 #else
 #error "Unsupported platform."
 #endif
   );
   return file_system_->root_path().Append(virtual_file_path);
 }
 
 }  // namespace pepper