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

ios/chrome/browser/sessions/ios_chrome_tab_restore_service_factory.cc

Index: ios/chrome/browser/sessions/ios_chrome_tab_restore_service_factory.cc
diff --git a/ios/chrome/browser/sessions/ios_chrome_tab_restore_service_factory.cc b/ios/chrome/browser/sessions/ios_chrome_tab_restore_service_factory.cc
index ff57860417a6a669ddde41cf98b5c602faa4d37e..b96e022c183d71eb26f085253859e08b227a150e 100644
--- a/ios/chrome/browser/sessions/ios_chrome_tab_restore_service_factory.cc
+++ b/ios/chrome/browser/sessions/ios_chrome_tab_restore_service_factory.cc
@@ -4,6 +4,7 @@
 
 #include "ios/chrome/browser/sessions/ios_chrome_tab_restore_service_factory.h"
 
+#include "base/memory/ptr_util.h"
 #include "base/memory/singleton.h"
 #include "components/keyed_service/ios/browser_state_dependency_manager.h"
 #include "components/sessions/core/persistent_tab_restore_service.h"
@@ -12,13 +13,14 @@
 
 namespace {
 
-scoped_ptr<KeyedService> BuildTabRestoreService(web::BrowserState* context) {
+std::unique_ptr<KeyedService> BuildTabRestoreService(
+    web::BrowserState* context) {
   DCHECK(!context->IsOffTheRecord());
 
   ios::ChromeBrowserState* browser_state =
       ios::ChromeBrowserState::FromBrowserState(context);
-  return make_scoped_ptr(new sessions::PersistentTabRestoreService(
-      make_scoped_ptr(new IOSChromeTabRestoreServiceClient(browser_state)),
+  return base::WrapUnique(new sessions::PersistentTabRestoreService(
+      base::WrapUnique(new IOSChromeTabRestoreServiceClient(browser_state)),
       nullptr));
 }
 
@@ -55,7 +57,7 @@ bool IOSChromeTabRestoreServiceFactory::ServiceIsNULLWhileTesting() const {
   return true;
 }
 
-scoped_ptr<KeyedService>
+std::unique_ptr<KeyedService>
 IOSChromeTabRestoreServiceFactory::BuildServiceInstanceFor(
     web::BrowserState* context) const {
   return BuildTabRestoreService(context);