mash: Replace int ShelfIDs with AppLaunchID strings.

ash/public/cpp/shelf_item_delegate.h

Index: ash/public/cpp/shelf_item_delegate.h
diff --git a/ash/public/cpp/shelf_item_delegate.h b/ash/public/cpp/shelf_item_delegate.h
index 23775b57caf0cb7f58dfc30c08e03ceaf9115145..7b4dce25d882b37bca816d67b4cd687deb5c79e7 100644
--- a/ash/public/cpp/shelf_item_delegate.h
+++ b/ash/public/cpp/shelf_item_delegate.h
@@ -7,7 +7,6 @@
 
 #include <string>
 
-#include "ash/public/cpp/app_launch_id.h"
 #include "ash/public/cpp/ash_public_export.h"
 #include "ash/public/cpp/shelf_types.h"
 #include "ash/public/interfaces/shelf.mojom.h"
@@ -25,14 +24,13 @@ using MenuItemList = std::vector<mojom::MenuItemPtr>;
 // various subclasses that implement the mojo interface.
 class ASH_PUBLIC_EXPORT ShelfItemDelegate : public mojom::ShelfItemDelegate {
  public:
-  explicit ShelfItemDelegate(const AppLaunchId& app_launch_id);
+  explicit ShelfItemDelegate(const ShelfID& shelf_id);
   ~ShelfItemDelegate() override;
 
-  ShelfID shelf_id() const { return shelf_id_; }
-  void set_shelf_id(ShelfID id) { shelf_id_ = id; }
-  const AppLaunchId& app_launch_id() const { return app_launch_id_; }
-  const std::string& app_id() const { return app_launch_id_.app_id(); }
-  const std::string& launch_id() const { return app_launch_id_.launch_id(); }
+  const ShelfID& shelf_id() const { return shelf_id_; }
+  void set_shelf_id(const ShelfID& shelf_id) { shelf_id_ = shelf_id; }
+  const std::string& app_id() const { return shelf_id_.app_id; }
+  const std::string& launch_id() const { return shelf_id_.launch_id; }
 
   bool image_set_by_controller() const { return image_set_by_controller_; }
   void set_image_set_by_controller(bool image_set_by_controller) {
@@ -46,14 +44,11 @@ class ASH_PUBLIC_EXPORT ShelfItemDelegate : public mojom::ShelfItemDelegate {
   virtual AppWindowLauncherItemController* AsAppWindowLauncherItemController();
 
  private:
-  // The app launch id; empty if there is no app associated with the item.
-  // Besides the application id, AppLaunchId also contains a launch id, which is
-  // an id that can be passed to an app when launched in order to support
-  // multiple shelf items per app. This id is used together with the app_id to
-  // uniquely identify each shelf item that has the same app_id.
-  const AppLaunchId app_launch_id_;
-
-  // A unique id assigned by the shelf model for the shelf item.
+  // The shelf id; empty if there is no app associated with the item.
+  // Besides the application id, ShelfID also contains a launch id, which is an
+  // id that can be passed to an app when launched in order to support multiple
+  // shelf items per app. This id is used together with the app_id to uniquely
+  // identify each shelf item that has the same app_id.
   ShelfID shelf_id_;
 
   // Set to true if the launcher item image has been set by the controller.