bluetooth: mac: Improve classic device discovery and update

device/bluetooth/bluetooth_device.h

Index: device/bluetooth/bluetooth_device.h
diff --git a/device/bluetooth/bluetooth_device.h b/device/bluetooth/bluetooth_device.h
index 2a5389c4f2b363a78ea4a01414b6db50c9748909..f4bd658a0eb6fddfc7de031f85169ef9bf601cb0 100644
--- a/device/bluetooth/bluetooth_device.h
+++ b/device/bluetooth/bluetooth_device.h
@@ -513,6 +513,9 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothDevice {
   // empty string.
   static std::string CanonicalizeAddress(const std::string& address);
 
+  // Update the last time this device was seen.
+  void UpdateTimestamp();
+
   // Return the timestamp for when this device was last seen.
   base::Time GetLastUpdateTime() const { return last_update_time_; }
 
@@ -577,9 +580,6 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothDevice {
 
   BluetoothDevice(BluetoothAdapter* adapter);
 
-  // Update the last time this device was seen.
-  void UpdateTimestamp();
-
   // Implements platform specific operations to initiate a GATT connection.
   // Subclasses must also call DidConnectGatt, DidFailToConnectGatt, or
   // DidDisconnectGatt immediately or asynchronously as the connection state