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

ios/web/web_state/web_view_internal_creation_util_unittest.mm

 // Copyright 2014 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 "ios/web/web_state/web_view_internal_creation_util.h"
 
 #import <CoreGraphics/CoreGraphics.h>
 #import <WebKit/WebKit.h>
 
-#import "base/mac/scoped_nsobject.h"
 #include "base/memory/ptr_util.h"
 #include "ios/web/public/test/fakes/test_browser_state.h"
 #import "ios/web/public/test/fakes/test_web_client.h"
 #include "ios/web/public/test/scoped_testing_web_client.h"
 #include "ios/web/public/test/web_test.h"
 #import "ios/web/public/web_view_creation_util.h"
 #import "ios/web/web_state/ui/wk_web_view_configuration_provider.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #import "testing/gtest_mac.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 // An arbitrary sized frame for testing web view creation.
 const CGRect kTestFrame = CGRectMake(5.0f, 10.0f, 15.0f, 20.0f);
 
 // A WebClient that stubs PreWebViewCreation call for testing purposes.
 class CreationUtilsWebClient : public web::TestWebClient {
  public:
   MOCK_CONST_METHOD0(PreWebViewCreation, void());
 };
@@ skipping 46 matching lines @@
   ASSERT_TRUE(web_view2);
 
   // Make sure that web views share the same non-nil process pool. Otherwise
   // cookie will not be immediately shared between different web views.
   EXPECT_TRUE([[web_view configuration] processPool]);
   EXPECT_EQ([[web_view configuration] processPool],
             [[web_view2 configuration] processPool]);
 }
 
 }  // namespace web