[ios] WebStateList owns all WebState it manages.

ios/chrome/browser/ui/toolbar/toolbar_model_impl_ios_unittest.mm

 // Copyright 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.
 
 #import <Foundation/Foundation.h>
 
 #include <memory>
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/memory/ptr_util.h"
@@ skipping 66 matching lines @@
   void SetUp() override {
     TestChromeBrowserState::Builder test_cbs_builder;
     chrome_browser_state_ = test_cbs_builder.Build();
     chrome_browser_state_->CreateBookmarkModel(true);
     bookmarks::test::WaitForBookmarkModelToLoad(
         ios::BookmarkModelFactory::GetForBrowserState(
             chrome_browser_state_.get()));
 
     // Create a WebStateList that will always return the test WebState as
     // the active WebState.
-    web_state_list_ = base::MakeUnique<WebStateList>(
-        &web_state_list_delegate_, WebStateList::WebStateOwned);
+    web_state_list_ = base::MakeUnique<WebStateList>(&web_state_list_delegate_);
     std::unique_ptr<ToolbarTestWebState> web_state =
         base::MakeUnique<ToolbarTestWebState>();
     web_state->SetBrowserState(chrome_browser_state_.get());
     web_state_ = web_state.get();
-    web_state_list_->InsertWebState(0, web_state.release());
+    web_state_list_->InsertWebState(0, std::move(web_state));
     web_state_list_->ActivateWebStateAt(0);
 
     toolbarModelDelegate_.reset(
         new ToolbarModelDelegateIOS(web_state_list_.get()));
     toolbarModel_.reset(new ToolbarModelImplIOS(toolbarModelDelegate_.get()));
   }
 
   web::TestWebThreadBundle thread_bundle_;
   std::unique_ptr<TestChromeBrowserState> chrome_browser_state_;
   FakeWebStateListDelegate web_state_list_delegate_;
@@ skipping 90 matching lines @@
                              base::UTF8ToUTF16(kWebUrl), GURL(kWebUrl));
   EXPECT_TRUE(toolbarModel_->IsCurrentTabBookmarked());
 
   // Remove the bookmark and verify the toolbar model indicates that the URL is
   // not bookmarked.
   bookmark_model->Remove(node);
   EXPECT_FALSE(toolbarModel_->IsCurrentTabBookmarked());
 }
 
 }  // namespace