Add bluetooth device type icons on MD system tray.

ash/common/system/tray/system_tray_delegate.cc

Index: ash/common/system/tray/system_tray_delegate.cc
diff --git a/ash/common/system/tray/system_tray_delegate.cc b/ash/common/system/tray/system_tray_delegate.cc
index 6db38c2df865fcbb4c13cb9a99c75329563655d7..89246f5ee7c9f05a2310878e42c74cb79b727f0e 100644
--- a/ash/common/system/tray/system_tray_delegate.cc
+++ b/ash/common/system/tray/system_tray_delegate.cc
@@ -20,6 +20,9 @@ NetworkIconInfo::~NetworkIconInfo() {}
 BluetoothDeviceInfo::BluetoothDeviceInfo()
     : connected(false), connecting(false), paired(false) {}
 
+BluetoothDeviceInfo::BluetoothDeviceInfo(const BluetoothDeviceInfo& other) =
+    default;
+
 BluetoothDeviceInfo::~BluetoothDeviceInfo() {}
 
 UpdateInfo::UpdateInfo()