Added function to provide the short board name of the device

ash/wm/lock_state_controller.cc

Index: ash/wm/lock_state_controller.cc
diff --git a/ash/wm/lock_state_controller.cc b/ash/wm/lock_state_controller.cc
index 5842f1706c5083ff5492aaf7dceb4902af91372d..22e6459bfcf30d071fa24a3eac24195e9f4b2291 100644
--- a/ash/wm/lock_state_controller.cc
+++ b/ash/wm/lock_state_controller.cc
@@ -488,7 +488,7 @@ void LockStateController::PreLockAnimationFinished(bool request_lock) {
       base::TimeDelta::FromMilliseconds(kLockFailTimeoutMs);
 #if defined(OS_CHROMEOS)
   // Increase lock timeout for slower hardware, see http://crbug.com/350628
-  const std::string board = base::SysInfo::GetLsbReleaseBoard();
+  const std::string board = base::SysInfo::GetStrippedReleaseBoard();
   if (board == "x86-mario" ||
       base::StartsWith(board, "x86-alex", base::CompareCase::SENSITIVE) ||
       base::StartsWith(board, "x86-zgb", base::CompareCase::SENSITIVE) ||