Reland of Make TrayDetailsView a ViewClickListener and ButtonListener

ash/common/system/chromeos/ime_menu/ime_list_view.h

Index: ash/common/system/chromeos/ime_menu/ime_list_view.h
diff --git a/ash/common/system/chromeos/ime_menu/ime_list_view.h b/ash/common/system/chromeos/ime_menu/ime_list_view.h
index 71e6f49c7995ae960d3be2371b18e8d6f28d0f26..8602eecb48b47ff0dd732898aed8228c82aac586 100644
--- a/ash/common/system/chromeos/ime_menu/ime_list_view.h
+++ b/ash/common/system/chromeos/ime_menu/ime_list_view.h
@@ -7,11 +7,10 @@
 
 #include "ash/common/system/tray/ime_info.h"
 #include "ash/common/system/tray/tray_details_view.h"
-#include "ash/common/system/tray/view_click_listener.h"
 
 namespace ash {
 // The detailed view for showing IME list.
-class ImeListView : public TrayDetailsView, public ViewClickListener {
+class ImeListView : public TrayDetailsView {
  public:
   enum SingleImeBehavior {
     // Shows the IME menu if there's only one IME in system.
@@ -33,8 +32,8 @@ class ImeListView : public TrayDetailsView, public ViewClickListener {
                       SingleImeBehavior single_ime_behavior);
 
  protected:
-  // ViewClickListener:
-  void OnViewClicked(views::View* sender) override;
+  // TrayDetailsView:
+  void HandleViewClicked(views::View* view) override;
 
  private:
   // To allow the test class to access |ime_map_|.