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

ios/chrome/browser/passwords/password_generation_agent.mm

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/chrome/browser/passwords/password_generation_agent.h"
 
 #include <stddef.h>
 
 #import "base/ios/weak_nsobject.h"
 #include "base/mac/foundation_util.h"
@@ skipping 103 matching lines @@
     passwordManagerDriver:(password_manager::PasswordManagerDriver*)driver
         JSPasswordManager:(JsPasswordManager*)JSPasswordManager
       JSSuggestionManager:(JsSuggestionManager*)JSSuggestionManager
       passwordsUiDelegate:(id<PasswordsUiDelegate>)UIDelegate
     NS_DESIGNATED_INITIALIZER;
 
 @end
 
 @implementation PasswordGenerationAgent {
   // Bridge to observe the web state from Objective-C.
-  scoped_ptr<web::WebStateObserverBridge> _webStateObserverBridge;
+  std::unique_ptr<web::WebStateObserverBridge> _webStateObserverBridge;
 
   // The origin URLs of forms on the current page that contain account creation
   // forms as reported by autofill.
   std::vector<GURL> _accountCreationFormOrigins;
 
   // The origin URLs of forms on the current page that have not been blacklisted
   // by the password manager.
   std::vector<GURL> _allowedGenerationFormOrigins;
 
   // Stores the account creation form we detected on the page.
-  scoped_ptr<autofill::PasswordForm> _possibleAccountCreationForm;
+  std::unique_ptr<autofill::PasswordForm> _possibleAccountCreationForm;
 
   // Password fields found in |_possibleAccountCreationForm|.
   std::vector<autofill::FormFieldData> _passwordFields;
 
   // The password field that triggers the password generation UI.
-  scoped_ptr<autofill::FormFieldData> _passwordGenerationField;
+  std::unique_ptr<autofill::FormFieldData> _passwordGenerationField;
 
   // Wrapper for suggestion JavaScript. Used for form navigation.
   base::scoped_nsobject<JsSuggestionManager> _JSSuggestionManager;
 
   // Wrapper for passwords JavaScript. Used for form filling.
   base::scoped_nsobject<JsPasswordManager> _JSPasswordManager;
 
   // Driver that is passed to PasswordManager when a password is generated.
   password_manager::PasswordManagerDriver* _passwordManagerDriver;
 
@@ skipping 307 matching lines @@
   DCHECK(_accessoryViewReadyCompletion);
   _accessoryViewReadyCompletion.get()([self currentAccessoryView], self);
 }
 
 - (BOOL)getLogKeyboardAccessoryMetrics {
   // Only store metrics for regular Autofill, not passwords.
   return NO;
 }
 
 @end