Hook up ProximityAuthSystem in EasyUnlockService.

components/proximity_auth/ble/bluetooth_low_energy_connection.cc

Index: components/proximity_auth/ble/bluetooth_low_energy_connection.cc
diff --git a/components/proximity_auth/ble/bluetooth_low_energy_connection.cc b/components/proximity_auth/ble/bluetooth_low_energy_connection.cc
index 52af29b32bf4fc1c35bb2133c6c32e93eb149a23..063d6de5df9c94ef4883507a8c38a48968ce0717 100644
--- a/components/proximity_auth/ble/bluetooth_low_energy_connection.cc
+++ b/components/proximity_auth/ble/bluetooth_low_energy_connection.cc
@@ -76,7 +76,6 @@ BluetoothLowEnergyConnection::BluetoothLowEnergyConnection(
 }
 
 BluetoothLowEnergyConnection::~BluetoothLowEnergyConnection() {
-  PA_LOG(INFO) << "Connection destroyed.";
   Disconnect();
   if (adapter_) {
     adapter_->RemoveObserver(this);
@@ -127,7 +126,7 @@ void BluetoothLowEnergyConnection::CreateGattConnection() {
 
 void BluetoothLowEnergyConnection::Disconnect() {
   if (sub_status() != SubStatus::DISCONNECTED) {
-    ClearWriteRequestsQueue();
+    weak_ptr_factory_.InvalidateWeakPtrs();
     StopNotifySession();
     characteristic_finder_.reset();
     if (gatt_connection_) {
@@ -318,8 +317,7 @@ BluetoothLowEnergyConnection::WriteRequest::WriteRequest(
       number_of_failed_attempts(0) {
 }
 
-BluetoothLowEnergyConnection::WriteRequest::~WriteRequest() {
-}
+BluetoothLowEnergyConnection::WriteRequest::~WriteRequest() {}
 
 void BluetoothLowEnergyConnection::CompleteConnection() {
   PA_LOG(INFO) << "Connection completed. Time elapsed: "
@@ -535,11 +533,6 @@ BluetoothLowEnergyConnection::BuildWriteRequest(
   return WriteRequest(value, is_last_write_for_wire_message);
 }
 
-void BluetoothLowEnergyConnection::ClearWriteRequestsQueue() {
-  while (!write_requests_queue_.empty())
-    write_requests_queue_.pop();
-}
-
 void BluetoothLowEnergyConnection::PrintTimeElapsed() {
   PA_LOG(INFO) << "Time elapsed: " << base::TimeTicks::Now() - start_time_;
 }