Substituting legacy protocol with uWeave protocol

components/proximity_auth/ble/bluetooth_low_energy_weave_packet_receiver.cc

Index: components/proximity_auth/ble/bluetooth_low_energy_weave_packet_receiver.cc
diff --git a/components/proximity_auth/ble/bluetooth_low_energy_weave_packet_receiver.cc b/components/proximity_auth/ble/bluetooth_low_energy_weave_packet_receiver.cc
index c8851c05c0cb0d67c19d5625436eea9d2b9e0762..ce5257205dc7d460add36bbdfa26ae6cfe593b3f 100644
--- a/components/proximity_auth/ble/bluetooth_low_energy_weave_packet_receiver.cc
+++ b/components/proximity_auth/ble/bluetooth_low_energy_weave_packet_receiver.cc
@@ -21,22 +21,22 @@ const uint16_t kMaxPacketSizeLowerBound = 20;
 
 }  // namespace
 
-BluetoothLowEnergyWeavePacketReceiver::Factory*
+std::shared_ptr<BluetoothLowEnergyWeavePacketReceiver::Factory>
     BluetoothLowEnergyWeavePacketReceiver::Factory::factory_instance_ = nullptr;
 
 // static
 std::unique_ptr<BluetoothLowEnergyWeavePacketReceiver>
 BluetoothLowEnergyWeavePacketReceiver::Factory::NewInstance(
     ReceiverType receiver_type) {
-  if (factory_instance_ == nullptr) {
-    factory_instance_ = new Factory();
+  if (!factory_instance_) {
+    factory_instance_.reset(new Factory());
   }
   return factory_instance_->BuildInstance(receiver_type);
 }
 
 // static
 void BluetoothLowEnergyWeavePacketReceiver::Factory::SetInstanceForTesting(
-    Factory* factory) {
+    std::shared_ptr<Factory> factory) {
   factory_instance_ = factory;
 }