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

ios/chrome/browser/autofill/form_input_accessory_view_controller.mm

Index: ios/chrome/browser/autofill/form_input_accessory_view_controller.mm
diff --git a/ios/chrome/browser/autofill/form_input_accessory_view_controller.mm b/ios/chrome/browser/autofill/form_input_accessory_view_controller.mm
index 4e819f43ad6e62a72e675a9b0e7947bb806d4e72..9185c637ed065e30f712dd5cd3d25a6b586f540a 100644
--- a/ios/chrome/browser/autofill/form_input_accessory_view_controller.mm
+++ b/ios/chrome/browser/autofill/form_input_accessory_view_controller.mm
@@ -4,12 +4,13 @@
 
 #import "ios/chrome/browser/autofill/form_input_accessory_view_controller.h"
 
+#include <memory>
+
 #include "base/ios/block_types.h"
 #include "base/ios/ios_util.h"
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_block.h"
 #include "base/mac/scoped_nsobject.h"
-#include "base/memory/scoped_ptr.h"
 #import "components/autofill/core/browser/keyboard_accessory_metrics_logger.h"
 #import "components/autofill/ios/browser/js_suggestion_manager.h"
 #import "ios/chrome/browser/autofill/form_input_accessory_view.h"
@@ -198,7 +199,7 @@ bool ComputeFramesOfKeyboardParts(UIView* inputAccessoryView,
 
 @implementation FormInputAccessoryViewController {
   // Bridge to observe the web state from Objective-C.
-  scoped_ptr<web::WebStateObserverBridge> _webStateObserverBridge;
+  std::unique_ptr<web::WebStateObserverBridge> _webStateObserverBridge;
 
   // Last registered keyboard rectangle.
   CGRect _keyboardFrame;
@@ -224,7 +225,7 @@ bool ComputeFramesOfKeyboardParts(UIView* inputAccessoryView,
   base::WeakNSProtocol<id<FormInputAccessoryViewProvider>> _currentProvider;
 
   // Logs UMA metrics for the keyboard accessory.
-  scoped_ptr<autofill::KeyboardAccessoryMetricsLogger>
+  std::unique_ptr<autofill::KeyboardAccessoryMetricsLogger>
       _keyboardAccessoryMetricsLogger;
 }