Remove pre-MD code from TrayDetailsView.

ash/common/system/tray/tray_details_view_unittest.cc

Index: ash/common/system/tray/tray_details_view_unittest.cc
diff --git a/ash/common/system/tray/tray_details_view_unittest.cc b/ash/common/system/tray/tray_details_view_unittest.cc
index f860a3a456cc2c031a5568d12749d62413d9522a..cfd5317b9d2b6c473290780f50e5f45972b23e3d 100644
--- a/ash/common/system/tray/tray_details_view_unittest.cc
+++ b/ash/common/system/tray/tray_details_view_unittest.cc
@@ -5,8 +5,6 @@
 #include "ash/common/system/tray/tray_details_view.h"
 
 #include "ash/common/ash_view_ids.h"
-#include "ash/common/system/tray/hover_highlight_view.h"
-#include "ash/common/system/tray/special_popup_row.h"
 #include "ash/common/system/tray/system_tray.h"
 #include "ash/common/system/tray/system_tray_item.h"
 #include "ash/common/system/tray/tray_constants.h"
@@ -43,8 +41,6 @@ class TestDetailsView : public TrayDetailsView {
     return tray_popup_header_button_;
   }
 
-  void FocusTitleRow() { title_row()->content()->RequestFocus(); }
-
   void CreateScrollerViews() { CreateScrollableList(); }
 
  private:
@@ -99,19 +95,6 @@ class TrayDetailsViewTest : public AshTestBase {
   TrayDetailsViewTest() {}
   ~TrayDetailsViewTest() override {}
 
-  HoverHighlightView* CreateAndShowHoverHighlightView() {
-    SystemTray* tray = GetPrimarySystemTray();
-    TestItem* test_item = new TestItem;
-    tray->AddTrayItem(base::WrapUnique(test_item));
-    tray->ShowDefaultView(BUBBLE_CREATE_NEW);
-    RunAllPendingInMessageLoop();
-    tray->ShowDetailedView(test_item, 0, true, BUBBLE_USE_EXISTING);
-    RunAllPendingInMessageLoop();
-
-    return static_cast<HoverHighlightView*>(
-        test_item->detailed_view()->title_row()->content());
-  }
-
   TrayPopupHeaderButton* CreateAndShowTrayPopupHeaderButton() {
     SystemTray* tray = GetPrimarySystemTray();
     TestItem* test_item = new TestItem;