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

ios/chrome/browser/bookmarks/startup_task_runner_service_factory.h

Index: ios/chrome/browser/bookmarks/startup_task_runner_service_factory.h
diff --git a/ios/chrome/browser/bookmarks/startup_task_runner_service_factory.h b/ios/chrome/browser/bookmarks/startup_task_runner_service_factory.h
index a6e21db03a4f1065dde463798637ec33b7c8dc1b..c50a8724614c5aa37fc01d9cd8d6c4b23b8bf71d 100644
--- a/ios/chrome/browser/bookmarks/startup_task_runner_service_factory.h
+++ b/ios/chrome/browser/bookmarks/startup_task_runner_service_factory.h
@@ -5,8 +5,9 @@
 #ifndef IOS_CHROME_BROWSER_BOOKMARKS_STARTUP_TASK_RUNNER_SERVICE_FACTORY_H_
 #define IOS_CHROME_BROWSER_BOOKMARKS_STARTUP_TASK_RUNNER_SERVICE_FACTORY_H_
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "components/keyed_service/ios/browser_state_keyed_service_factory.h"
 
 namespace base {
@@ -37,7 +38,7 @@ class StartupTaskRunnerServiceFactory : public BrowserStateKeyedServiceFactory {
   ~StartupTaskRunnerServiceFactory() override;
 
   // BrowserStateKeyedServiceFactory implementation.
-  scoped_ptr<KeyedService> BuildServiceInstanceFor(
+  std::unique_ptr<KeyedService> BuildServiceInstanceFor(
       web::BrowserState* context) const override;
 
   DISALLOW_COPY_AND_ASSIGN(StartupTaskRunnerServiceFactory);