[ObjC ARC] Converts ios/chrome/browser/native_app_launcher:unit_tests_internal to ARC.

ios/chrome/browser/native_app_launcher/native_app_navigation_util_unittest.mm

 // Copyright 2017 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 "ios/chrome/browser/native_app_launcher/native_app_navigation_util.h"
 
 #include "base/memory/ptr_util.h"
 #import "ios/web/public/test/fakes/test_navigation_manager.h"
 #import "ios/web/public/test/fakes/test_web_state.h"
 #include "testing/platform_test.h"
 #include "ui/base/page_transition_types.h"
 #include "url/gurl.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 // Tests the implementation of IsLinkNavigation(). The function being tested
 // uses public NavigationManager interfaces and can be tested by using
 // TestNavigationManager that implements the same interface.
 class NativeAppNavigationUtilsTest : public PlatformTest {
  protected:
   void SetUp() override {
     PlatformTest::SetUp();
     std::unique_ptr<web::TestNavigationManager> test_navigation_manager =
         base::MakeUnique<web::TestNavigationManager>();
     test_navigation_manager_ = test_navigation_manager.get();
@@ skipping 53 matching lines @@
   EXPECT_TRUE(native_app_launcher::IsLinkNavigation(web_state()));
 }
 
 // The first non-redirect entry is tested. Earlier redirects do not matter.
 TEST_F(NativeAppNavigationUtilsTest, TestTypedUrlWithRedirectEarlier) {
   AddItem("http://foo.com/page0", ui::PAGE_TRANSITION_LINK);
   AddItem("http://bar.com/page1", ui::PAGE_TRANSITION_CLIENT_REDIRECT);
   AddItem("http://blah.com/page2", ui::PAGE_TRANSITION_TYPED);
   EXPECT_FALSE(native_app_launcher::IsLinkNavigation(web_state()));
 }