mash: Refactor ChromeLauncherController's ShelfDelegate code.

ash/shelf/shelf_view_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/common/shelf/shelf_view.h"
 
 #include <algorithm>
 #include <memory>
 #include <utility>
 #include <vector>
@@ skipping 245 matching lines @@
 
   void set_is_app_pinned(bool is_pinned) { is_app_pinned_ = is_pinned; }
 
   // ShelfDelegate overrides:
   ShelfID GetShelfIDForAppID(const std::string& app_id) override {
     unsigned id = kInvalidShelfID;
     EXPECT_TRUE(base::StringToUint(app_id, &id));
     return base::checked_cast<ShelfID>(id);
   }
 
-  bool HasShelfIDToAppIDMapping(ShelfID id) const override { return true; }
-
   const std::string& GetAppIDForShelfID(ShelfID id) override {
     // Use |app_id_| member variable because returning a reference to local
     // variable is not allowed.
     app_id_ = base::IntToString(id);
     return app_id_;
   }
 
   void PinAppWithID(const std::string& app_id) override { NOTREACHED(); }
 
   bool IsAppPinned(const std::string& app_id) override {
@@ skipping 2750 matching lines @@
   EXPECT_EQ(views::InkDropState::ACTIVATED,
             overflow_button_ink_drop_->GetTargetInkDropState());
   EXPECT_THAT(overflow_button_ink_drop_->GetAndResetRequestedStates(),
               IsEmpty());
 
   ASSERT_TRUE(test_api_->IsShowingOverflowBubble());
 }
 
 }  // namespace test
 }  // namespace ash