[ObjC ARC] Converts ios/chrome/test/app:test_support to ARC.

ios/chrome/test/app/sync_test_util.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.
 
 #import "ios/chrome/test/app/sync_test_util.h"
 
 #include <set>
 #include <string>
 
 #include "base/logging.h"
@@ skipping 16 matching lines @@
 #include "components/sync/test/fake_server/unique_client_entity.h"
 #include "ios/chrome/browser/autofill/personal_data_manager_factory.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
 #include "ios/chrome/browser/history/history_service_factory.h"
 #include "ios/chrome/browser/sync/ios_chrome_profile_sync_service_factory.h"
 #include "ios/chrome/browser/sync/sync_setup_service.h"
 #include "ios/chrome/browser/sync/sync_setup_service_factory.h"
 #import "ios/chrome/test/app/chrome_test_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 fake_server::FakeServer* gSyncFakeServer = nullptr;
 
 NSString* const kSyncTestErrorDomain = @"SyncTestDomain";
 
 // Overrides the network resources of the current ProfileSyncService with
 // |resources|.
 void OverrideSyncNetworkResources(
     std::unique_ptr<syncer::NetworkResources> resources) {
@@ skipping 232 matching lines @@
           browser_state, ServiceAccessType::EXPLICIT_ACCESS);
 
   const GURL block_safe_url(url);
   std::set<GURL> origins;
   origins.insert(block_safe_url);
 
   __block bool history_service_callback_called = false;
   __block int count = 0;
   using history::OriginCountAndLastVisitMap;
   history_service->GetCountsAndLastVisitForOrigins(
-      origins, base::BindBlock(^(const OriginCountAndLastVisitMap& result) {
+      origins, base::BindBlockArc(^(const OriginCountAndLastVisitMap& result) {
         auto iter = result.find(block_safe_url);
         if (iter != result.end())
           count = iter->second.first;
         history_service_callback_called = true;
       }));
 
   NSDate* deadline = [NSDate dateWithTimeIntervalSinceNow:4.0];
   while (!history_service_callback_called &&
          [[NSDate date] compare:deadline] != NSOrderedDescending) {
     base::test::ios::SpinRunLoopWithMaxDelay(
@@ skipping 42 matching lines @@
     }
   }
   if (!entity_id.empty()) {
     std::unique_ptr<fake_server::FakeServerEntity> entity;
     entity = fake_server::TombstoneEntity::Create(entity_id, std::string());
     gSyncFakeServer->InjectEntity(std::move(entity));
   }
 }
 
 }  // namespace chrome_test_util