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

ios/chrome/browser/passwords/ios_chrome_password_manager_client.h

Index: ios/chrome/browser/passwords/ios_chrome_password_manager_client.h
diff --git a/ios/chrome/browser/passwords/ios_chrome_password_manager_client.h b/ios/chrome/browser/passwords/ios_chrome_password_manager_client.h
index 7dd4735ccc0f104b2477cf84a6234fed154a5f1a..0b2e4a846e80c82ded50dc5cc5f68a370ed68309 100644
--- a/ios/chrome/browser/passwords/ios_chrome_password_manager_client.h
+++ b/ios/chrome/browser/passwords/ios_chrome_password_manager_client.h
@@ -22,7 +22,7 @@ class PasswordFormManager;
 
 // Shows UI to prompt the user to save the password.
 - (void)showSavePasswordInfoBar:
-    (scoped_ptr<password_manager::PasswordFormManager>)formToSave;
+    (std::unique_ptr<password_manager::PasswordFormManager>)formToSave;
 
 @property(readonly, nonatomic) ios::ChromeBrowserState* browserState;
 
@@ -42,7 +42,7 @@ class IOSChromePasswordManagerClient
   // password_manager::PasswordManagerClient implementation.
   password_manager::PasswordSyncState GetPasswordSyncState() const override;
   bool PromptUserToSaveOrUpdatePassword(
-      scoped_ptr<password_manager::PasswordFormManager> form_to_save,
+      std::unique_ptr<password_manager::PasswordFormManager> form_to_save,
       password_manager::CredentialSourceType type,
       bool update_password) override;
   bool PromptUserToChooseCredentials(
@@ -50,15 +50,16 @@ class IOSChromePasswordManagerClient
       ScopedVector<autofill::PasswordForm> federated_forms,
       const GURL& origin,
       const CredentialsCallback& callback) override;
-  void AutomaticPasswordSave(scoped_ptr<password_manager::PasswordFormManager>
-                                 saved_form_manager) override;
+  void AutomaticPasswordSave(
+      std::unique_ptr<password_manager::PasswordFormManager> saved_form_manager)
+      override;
   bool IsOffTheRecord() const override;
   PrefService* GetPrefs() override;
   password_manager::PasswordStore* GetPasswordStore() const override;
   void NotifyUserAutoSignin(ScopedVector<autofill::PasswordForm> local_forms,
                             const GURL& origin) override;
   void NotifyUserCouldBeAutoSignedIn(
-      scoped_ptr<autofill::PasswordForm> form) override;
+      std::unique_ptr<autofill::PasswordForm> form) override;
   void NotifySuccessfulLoginWithExistingPassword(
       const autofill::PasswordForm& form) override;
   void ForceSavePassword() override;