Make TrayDetailsView a ViewClickListener and ButtonListener

ash/common/system/ime/tray_ime_chromeos.cc

Index: ash/common/system/ime/tray_ime_chromeos.cc
diff --git a/ash/common/system/ime/tray_ime_chromeos.cc b/ash/common/system/ime/tray_ime_chromeos.cc
index 8b69585bbd04986a522a33bc42a0238ac7586e2c..8ebb5d4c0167fd148a11559e56ab53fdf4d319e5 100644
--- a/ash/common/system/ime/tray_ime_chromeos.cc
+++ b/ash/common/system/ime/tray_ime_chromeos.cc
@@ -118,27 +118,26 @@ class IMEDetailedView : public ImeListView {
     ImeListView::Update(list, property_list, show_keyboard_toggle,
                         single_ime_behavior);
     if (login_ != LoginStatus::NOT_LOGGED_IN && login_ != LoginStatus::LOCKED &&
-        !WmShell::Get()->GetSessionStateDelegate()->IsInSecondaryLoginScreen())
+        !WmShell::Get()
+             ->GetSessionStateDelegate()
+             ->IsInSecondaryLoginScreen()) {
       AppendSettings();
-    AppendHeaderEntry();
+    }
+
+    CreateTitleRow(IDS_ASH_STATUS_TRAY_IME, this);
   }
 
  private:
   // ImeListView:
-  void OnViewClicked(views::View* sender) override {
-    ImeListView::OnViewClicked(sender);
-    SystemTrayDelegate* delegate = WmShell::Get()->system_tray_delegate();
-    if (sender == footer()->content()) {
-      TransitionToDefaultView();
-    } else if (sender == settings_) {
+  void HandleViewClicked(views::View* view) override {
+    ImeListView::HandleViewClicked(view);
+    if (view == settings_) {
       WmShell::Get()->RecordUserMetricsAction(
           UMA_STATUS_AREA_IME_SHOW_DETAILED);
-      delegate->ShowIMESettings();
+      WmShell::Get()->system_tray_delegate()->ShowIMESettings();
     }
   }
 
-  void AppendHeaderEntry() { CreateSpecialRow(IDS_ASH_STATUS_TRAY_IME, this); }
-
   void AppendSettings() {
     HoverHighlightView* container = new HoverHighlightView(this);
     container->AddLabel(