mash: Refactor ChromeLauncherController's ShelfDelegate code.

ash/common/test/test_shelf_delegate.h

Index: ash/common/test/test_shelf_delegate.h
diff --git a/ash/common/test/test_shelf_delegate.h b/ash/common/test/test_shelf_delegate.h
index 5e274db60b460490e2f60eb7780b3d0c7981cc39..8bcec8d603b53f16cf760fc9d76a3d7fd603ae96 100644
--- a/ash/common/test/test_shelf_delegate.h
+++ b/ash/common/test/test_shelf_delegate.h
@@ -5,7 +5,6 @@
 #ifndef ASH_COMMON_TEST_TEST_SHELF_DELEGATE_H_
 #define ASH_COMMON_TEST_TEST_SHELF_DELEGATE_H_
 
-#include <map>
 #include <memory>
 #include <set>
 #include <string>
@@ -33,14 +32,10 @@ class TestShelfDelegate : public ShelfDelegate, public aura::WindowObserver {
   // STATUS_CLOSED.
   void AddShelfItem(WmWindow* window);
 
-  // Adds a ShelfItem for the given |window| and adds a mapping from the added
-  // ShelfItem's ShelfID to the given |app_id|. The ShelfItem's status will be
-  // STATUS_CLOSED.
+  // Adds a ShelfItem for the given |window| and |app_id|. The ShelfItem's
+  // status will be STATUS_CLOSED.
   void AddShelfItem(WmWindow* window, const std::string& app_id);
 
-  // Adds a ShelfItem for the given |window| with the specified |status|.
-  void AddShelfItem(WmWindow* window, ShelfItemStatus status);
-
   // Removes the ShelfItem for the specified |window| and unpins it if it was
   // pinned. The |window|'s ShelfID to app id mapping will be removed if it
   // exists.
@@ -56,28 +51,18 @@ class TestShelfDelegate : public ShelfDelegate, public aura::WindowObserver {
   ShelfID GetShelfIDForAppID(const std::string& app_id) override;
   ShelfID GetShelfIDForAppIDAndLaunchID(const std::string& app_id,
                                         const std::string& launch_id) override;
-  bool HasShelfIDToAppIDMapping(ShelfID id) const override;
   const std::string& GetAppIDForShelfID(ShelfID id) override;
   void PinAppWithID(const std::string& app_id) override;
   bool IsAppPinned(const std::string& app_id) override;
   void UnpinAppWithID(const std::string& app_id) override;
 
  private:
-  // Adds a mapping from a ShelfID to an app id.
-  void AddShelfIDToAppIDMapping(ShelfID shelf_id, const std::string& app_id);
-
-  // Removes the mapping from a ShelfID to an app id.
-  void RemoveShelfIDToAppIDMapping(ShelfID shelf_id);
-
   static TestShelfDelegate* instance_;
 
   std::unique_ptr<ShelfInitializer> shelf_initializer_;
 
   std::set<std::string> pinned_apps_;
 
-  // Tracks the ShelfID to app id mappings.
-  std::map<ShelfID, std::string> shelf_id_to_app_id_map_;
-
   DISALLOW_COPY_AND_ASSIGN(TestShelfDelegate);
 };