Transform RefCountedDeleteOnMessageLoop to RefCountedDeleteOnSequence.

extensions/browser/sandboxed_unpacker.cc

Index: extensions/browser/sandboxed_unpacker.cc
diff --git a/extensions/browser/sandboxed_unpacker.cc b/extensions/browser/sandboxed_unpacker.cc
index e1a83feff53e3ed340f981aaf0220d752c0ee3f7..9c2746a1309754136e2284b242b18cf2167084b8 100644
--- a/extensions/browser/sandboxed_unpacker.cc
+++ b/extensions/browser/sandboxed_unpacker.cc
@@ -210,7 +210,7 @@ bool ReadMessageCatalogsFromFile(const base::FilePath& extension_path,
 }  // namespace
 
 SandboxedUnpackerClient::SandboxedUnpackerClient()
-    : RefCountedDeleteOnMessageLoop<SandboxedUnpackerClient>(
+    : RefCountedDeleteOnSequence<SandboxedUnpackerClient>(
           content::BrowserThread::GetTaskRunnerForThread(
               content::BrowserThread::UI)) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);