media: Change auto to not deduce raw pointers.

media/midi/midi_manager_alsa.cc

Index: media/midi/midi_manager_alsa.cc
diff --git a/media/midi/midi_manager_alsa.cc b/media/midi/midi_manager_alsa.cc
index 6f6a686258c8decf489e4492405b5ae877f814b7..751b736324794c09ff327484c6ef8fd7e1bf21d2 100644
--- a/media/midi/midi_manager_alsa.cc
+++ b/media/midi/midi_manager_alsa.cc
@@ -689,7 +689,7 @@ MidiManagerAlsa::AlsaSeqState::ToMidiPortState(const AlsaCardMap& alsa_cards) {
   int card_midi_device = -1;
   for (const auto& client_pair : clients_) {
     int client_id = client_pair.first;
-    const auto& client = client_pair.second.get();
+    auto* client = client_pair.second.get();
 
     // Get client metadata.
     const std::string client_name = client->name();