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 8b4415b062ad35e200f89a1e7d2ad32771c43b76..1fe32887a91778bf5d30b2054d4513ccfe3c7302 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()