bluetooth: mac: Improve classic device discovery and update

device/bluetooth/bluetooth_discovery_manager_mac.mm

Index: device/bluetooth/bluetooth_discovery_manager_mac.mm
diff --git a/device/bluetooth/bluetooth_discovery_manager_mac.mm b/device/bluetooth/bluetooth_discovery_manager_mac.mm
index a2a024d777b29c8614ce7e892e7c16c433f3a5d9..ebeb01dc0904dccea9e4880e3d5def3eaa0ac8c1 100644
--- a/device/bluetooth/bluetooth_discovery_manager_mac.mm
+++ b/device/bluetooth/bluetooth_discovery_manager_mac.mm
@@ -31,7 +31,7 @@ class BluetoothDiscoveryManagerMacClassic;
 
 namespace device {
 
-// ementation of BluetoothDiscoveryManagerMac for Bluetooth classic device
+// Implementation of BluetoothDiscoveryManagerMac for Bluetooth classic device
 // discovery, using the IOBluetooth framework.
 class BluetoothDiscoveryManagerMacClassic
     : public BluetoothDiscoveryManagerMac {
@@ -58,6 +58,10 @@ class BluetoothDiscoveryManagerMacClassic
     DVLOG(1) << "Discovery requested";
     should_do_discovery_ = true;
 
+    // Clean the cache so that new discovery sessions find previously
+    // discovered devices as well.
+    [inquiry_ clearFoundDevices];
+
     if (inquiry_running_) {
       DVLOG(1) << "Device inquiry already running";
       return true;