Convert //components/proximity_auth from scoped_ptr to std::unique_ptr

components/proximity_auth/bluetooth_connection.cc

Index: components/proximity_auth/bluetooth_connection.cc
diff --git a/components/proximity_auth/bluetooth_connection.cc b/components/proximity_auth/bluetooth_connection.cc
index f0cce29974e33fa7127fc889f86f7842b21586d8..461533e5a384942ed11e10cd8a124621495f513b 100644
--- a/components/proximity_auth/bluetooth_connection.cc
+++ b/components/proximity_auth/bluetooth_connection.cc
@@ -72,7 +72,8 @@ void BluetoothConnection::Disconnect() {
   }
 }
 
-void BluetoothConnection::SendMessageImpl(scoped_ptr<WireMessage> message) {
+void BluetoothConnection::SendMessageImpl(
+    std::unique_ptr<WireMessage> message) {
   DCHECK_EQ(status(), CONNECTED);
 
   // Serialize the message.