Enable tests in TrayIMETest for MD

ash/common/system/chromeos/ime_menu/ime_menu_tray_unittest.cc

Index: ash/common/system/chromeos/ime_menu/ime_menu_tray_unittest.cc
diff --git a/ash/common/system/chromeos/ime_menu/ime_menu_tray_unittest.cc b/ash/common/system/chromeos/ime_menu/ime_menu_tray_unittest.cc
index bc8d7da4e51d8c415246215e985e19cacd169cd3..a7ebfc313d4d25849c2d40e5f5b9ee10d0c16aef 100644
--- a/ash/common/system/chromeos/ime_menu/ime_menu_tray_unittest.cc
+++ b/ash/common/system/chromeos/ime_menu/ime_menu_tray_unittest.cc
@@ -52,8 +52,8 @@ class ImeMenuTrayTest : public test::AshTestBase {
   // Returns true if the IME menu list has been updated with the right IME list.
   bool IsTrayImeListValid(const std::vector<IMEInfo>& expected_imes,
                           const IMEInfo& expected_current_ime) {
-    std::map<views::View*, std::string> ime_map =
-        GetTray()->ime_list_view_->ime_map_;
+    const std::map<views::View*, std::string>& ime_map =
+        ImeListViewTestApi(GetTray()->ime_list_view_).ime_map();
     if (ime_map.size() != expected_imes.size())
       return false;