[ObjC ARC] Converts ios/web:web to ARC.

ios/web/webui/web_ui_mojo_inttest.mm

 // Copyright 2016 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 <memory>
 
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
 #include "base/threading/thread_task_runner_handle.h"
 #import "ios/testing/wait_util.h"
@@ skipping 128 matching lines @@
   void SetUp() override {
     WebIntTest::SetUp();
     ui_handler_ = base::MakeUnique<TestUIHandler>();
     web::WebState::CreateParams params(GetBrowserState());
     web_state_ = base::MakeUnique<web::WebStateImpl>(params);
     web_state_->GetNavigationManagerImpl().InitializeSession();
     WebUIIOSControllerFactory::RegisterFactory(
         new TestWebUIControllerFactory(ui_handler_.get()));
   }
 
+  void TearDown() override {
+    web_state_.reset();
+    WebIntTest::TearDown();
+  }

[Eugene But (OOO till 7-30), 2017/06/12 06:12:52]

nit: Keep a linebreak after |TearDown|?

[PL, 2017/06/14 00:31:11]

Oh yes, thanks!

   // Returns WebState which loads test WebUI page.
   WebStateImpl* web_state() { return web_state_.get(); }
   // Returns UI handler which communicates with WebUI page.
   TestUIHandler* test_ui_handler() { return ui_handler_.get(); }
 
  private:
   std::unique_ptr<WebStateImpl> web_state_;
   std::unique_ptr<TestUIHandler> ui_handler_;
 };
 
@@ skipping 28 matching lines @@
     loop.Run();
     return test_ui_handler()->IsFinReceived();
   });
 
   ASSERT_TRUE(fin_received);
   EXPECT_FALSE(web_state()->IsLoading());
   EXPECT_EQ(url, web_state()->GetLastCommittedURL());
 }
 
 }  // namespace web