Convert //ios from scoped_ptr to std::unique_ptr.

ios/chrome/browser/suggestions/suggestions_service_factory.mm

Index: ios/chrome/browser/suggestions/suggestions_service_factory.mm
diff --git a/ios/chrome/browser/suggestions/suggestions_service_factory.mm b/ios/chrome/browser/suggestions/suggestions_service_factory.mm
index 52e03d0dbdcc6459249547683ffa85823e9a9fbe..b771df486335fba4df62daf1503ee748f87f7454 100644
--- a/ios/chrome/browser/suggestions/suggestions_service_factory.mm
+++ b/ios/chrome/browser/suggestions/suggestions_service_factory.mm
@@ -7,6 +7,7 @@
 #include <utility>
 
 #include "base/files/file_path.h"
+#include "base/memory/ptr_util.h"
 #include "base/memory/singleton.h"
 #include "base/sequenced_task_runner.h"
 #include "base/threading/sequenced_worker_pool.h"
@@ -58,7 +59,8 @@ SuggestionsServiceFactory::SuggestionsServiceFactory()
 SuggestionsServiceFactory::~SuggestionsServiceFactory() {
 }
 
-scoped_ptr<KeyedService> SuggestionsServiceFactory::BuildServiceInstanceFor(
+std::unique_ptr<KeyedService>
+SuggestionsServiceFactory::BuildServiceInstanceFor(
     web::BrowserState* context) const {
   base::SequencedWorkerPool* sequenced_worker_pool =
       web::WebThread::GetBlockingPool();
@@ -76,18 +78,18 @@ scoped_ptr<KeyedService> SuggestionsServiceFactory::BuildServiceInstanceFor(
       IOSChromeProfileSyncServiceFactory::GetForBrowserState(browser_state);
   base::FilePath database_dir(
       browser_state->GetStatePath().Append(kThumbnailDirectory));
-  scoped_ptr<SuggestionsStore> suggestions_store(
+  std::unique_ptr<SuggestionsStore> suggestions_store(
       new SuggestionsStore(browser_state->GetPrefs()));
-  scoped_ptr<BlacklistStore> blacklist_store(
+  std::unique_ptr<BlacklistStore> blacklist_store(
       new BlacklistStore(browser_state->GetPrefs()));
-  scoped_ptr<leveldb_proto::ProtoDatabaseImpl<ImageData>> db(
+  std::unique_ptr<leveldb_proto::ProtoDatabaseImpl<ImageData>> db(
       new leveldb_proto::ProtoDatabaseImpl<ImageData>(background_task_runner));
-  scoped_ptr<ImageFetcher> image_fetcher(new ImageFetcherImpl(
+  std::unique_ptr<ImageFetcher> image_fetcher(new ImageFetcherImpl(
       browser_state->GetRequestContext(), sequenced_worker_pool));
-  scoped_ptr<ImageManager> thumbnail_manager(new ImageManager(
+  std::unique_ptr<ImageManager> thumbnail_manager(new ImageManager(
       std::move(image_fetcher), std::move(db), database_dir,
       web::WebThread::GetTaskRunnerForThread(web::WebThread::DB)));
-  return make_scoped_ptr(new SuggestionsService(
+  return base::WrapUnique(new SuggestionsService(
       signin_manager, token_service, sync_service,
       browser_state->GetRequestContext(), std::move(suggestions_store),
       std::move(thumbnail_manager), std::move(blacklist_store)));