Run clang-modernize -use-nullptr over src/extensions/.

extensions/common/permissions/manifest_permission.cc

 // Copyright 2013 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 "extensions/common/permissions/manifest_permission.h"
 
 #include "base/json/json_writer.h"
 #include "extensions/common/manifest_handler.h"
 #include "ipc/ipc_message.h"
 #include "ipc/ipc_message_utils.h"
@@ skipping 22 matching lines @@
   singleton.Append(value);
   IPC::WriteParam(m, singleton);
 }
 
 bool ManifestPermission::Read(const IPC::Message* m, PickleIterator* iter) {
   base::ListValue singleton;
   if (!IPC::ReadParam(m, iter, &singleton))
     return false;
   if (singleton.GetSize() != 1)
     return false;
-  base::Value* value = NULL;
+  base::Value* value = nullptr;
   if (!singleton.Get(0, &value))
     return false;
   return FromValue(value);
 }
 
 void ManifestPermission::Log(std::string* log) const {
   base::JSONWriter::WriteWithOptions(
       ToValue().get(), base::JSONWriter::OPTIONS_PRETTY_PRINT, log);
 }
 
 }  // namespace extensions