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

ios/chrome/browser/signin/account_reconcilor_factory.h

Index: ios/chrome/browser/signin/account_reconcilor_factory.h
diff --git a/ios/chrome/browser/signin/account_reconcilor_factory.h b/ios/chrome/browser/signin/account_reconcilor_factory.h
index 6a69d75e29a01d6d4037264aec369c5e1153dbac..553fb7d85c1cb74e6063fcf4f8fd0a74e959187c 100644
--- a/ios/chrome/browser/signin/account_reconcilor_factory.h
+++ b/ios/chrome/browser/signin/account_reconcilor_factory.h
@@ -5,8 +5,9 @@
 #ifndef IOS_CHROME_BROWSER_SIGNIN_ACCOUNT_RECONCILOR_FACTORY_H_
 #define IOS_CHROME_BROWSER_SIGNIN_ACCOUNT_RECONCILOR_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 {
@@ -40,7 +41,7 @@ class AccountReconcilorFactory : public BrowserStateKeyedServiceFactory {
   ~AccountReconcilorFactory() override;
 
   // BrowserStateKeyedServiceFactory:
-  scoped_ptr<KeyedService> BuildServiceInstanceFor(
+  std::unique_ptr<KeyedService> BuildServiceInstanceFor(
       web::BrowserState* context) const override;
 
   DISALLOW_COPY_AND_ASSIGN(AccountReconcilorFactory);