Convert //ash from scoped_ptr to std::unique_ptr

ash/shelf/shelf_model_unittest.cc

 // Copyright 2013 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/shelf/shelf_model.h"
 
 #include <set>
 #include <string>
 
 #include "ash/ash_switches.h"
@@ skipping 73 matching lines @@
     EXPECT_EQ(1, model_->item_count());
 
     model_->AddObserver(observer_.get());
   }
 
   void TearDown() override {
     observer_.reset();
     model_.reset();
   }
 
-  scoped_ptr<ShelfModel> model_;
-  scoped_ptr<TestShelfModelObserver> observer_;
+  std::unique_ptr<ShelfModel> model_;
+  std::unique_ptr<TestShelfModelObserver> observer_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ShelfModelTest);
 };
 
 TEST_F(ShelfModelTest, BasicAssertions) {
   // Add an item.
   ShelfItem item;
   item.type = TYPE_APP_SHORTCUT;
   int index = model_->Add(item);
@@ skipping 236 matching lines @@
   // Now change the type of the second item and make sure that it is moving
   // behind the shortcuts.
   item.type = TYPE_PLATFORM_APP;
   model_->Set(app2_index, item);
 
   // The item should have moved in front of the app launcher.
   EXPECT_EQ(TYPE_PLATFORM_APP, model_->items()[4].type);
 }
 
 }  // namespace ash