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

ios/chrome/browser/infobars/infobar.h

Index: ios/chrome/browser/infobars/infobar.h
diff --git a/ios/chrome/browser/infobars/infobar.h b/ios/chrome/browser/infobars/infobar.h
index faad0a7bd61cc529f09f3faf0a7790bd7098bd42..a6cf4b1126f0c7439ea807947b932fcadd592b0f 100644
--- a/ios/chrome/browser/infobars/infobar.h
+++ b/ios/chrome/browser/infobars/infobar.h
@@ -5,6 +5,8 @@
 #ifndef IOS_CHROME_BROWSER_INFOBARS_INFOBAR_H_
 #define IOS_CHROME_BROWSER_INFOBARS_INFOBAR_H_
 
+#include <memory>
+
 #include "base/mac/scoped_nsobject.h"
 #include "base/macros.h"
 #include "components/infobars/core/infobar.h"
@@ -19,7 +21,7 @@ class InfoBarDelegate;
 // InfoBar for iOS acts as a UIViewController for InfoBarView.
 class InfoBarIOS : public infobars::InfoBar, public InfoBarViewDelegate {
  public:
-  explicit InfoBarIOS(scoped_ptr<infobars::InfoBarDelegate> delegate);
+  explicit InfoBarIOS(std::unique_ptr<infobars::InfoBarDelegate> delegate);
   ~InfoBarIOS() override;
 
   // Layouts the infobar using data from delegate and prepare it for adding to