Revert of Remove ScopedVector from all other codes in media/

media/blink/webcontentdecryptionmodulesession_impl.cc

Index: media/blink/webcontentdecryptionmodulesession_impl.cc
diff --git a/media/blink/webcontentdecryptionmodulesession_impl.cc b/media/blink/webcontentdecryptionmodulesession_impl.cc
index 41f39297783d110a26ce577b884347de61b94699..6db62b987276d11ca3dfad6681add5e2fb76585d 100644
--- a/media/blink/webcontentdecryptionmodulesession_impl.cc
+++ b/media/blink/webcontentdecryptionmodulesession_impl.cc
@@ -496,7 +496,7 @@
   blink::WebVector<blink::WebEncryptedMediaKeyInformation> keys(
       keys_info.size());
   for (size_t i = 0; i < keys_info.size(); ++i) {
-    auto& key_info = keys_info[i];
+    auto* key_info = keys_info[i];
     keys[i].SetId(blink::WebData(reinterpret_cast<char*>(&key_info->key_id[0]),
                                  key_info->key_id.size()));
     keys[i].SetStatus(convertStatus(key_info->status));