Enable Update Password UI on iOS behind a flag

ios/chrome/browser/passwords/ios_chrome_password_manager_client.mm

 // Copyright 2015 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/ios_chrome_password_manager_client.h"
 
 #include <memory>
 #include <utility>
 
 #include "components/autofill/core/common/password_form.h"
@@ skipping 56 matching lines @@
   NOTIMPLEMENTED();
   return false;
 }
 
 bool IOSChromePasswordManagerClient::PromptUserToSaveOrUpdatePassword(
     std::unique_ptr<PasswordFormManager> form_to_save,
     password_manager::CredentialSourceType type,
     bool update_password) {
   if (form_to_save->IsBlacklisted())
     return false;
-  [delegate_ showSavePasswordInfoBar:std::move(form_to_save)];
+
+  if (ios_internal::experimental_flags::IsUpdatePasswordUIEnabled() &&

[sdefresne, 2016/07/05 13:29:55]

I think this should be "experimental_flags::IsUpdatePasswordUIEnabled()" (i.e.
without "ios_internal::").

[Jackie Quinn, 2016/07/05 13:52:34]

Yes, thanks. Done.

+      update_password) {
+    [delegate_ showUpdatePasswordInfoBar:std::move(form_to_save)];
+  } else {
+    [delegate_ showSavePasswordInfoBar:std::move(form_to_save)];
+  }
+
   return true;
 }
 
 void IOSChromePasswordManagerClient::AutomaticPasswordSave(
     std::unique_ptr<PasswordFormManager> saved_form_manager) {
   NOTIMPLEMENTED();
 }
 
 bool IOSChromePasswordManagerClient::IsOffTheRecord() const {
   return (delegate_.browserState)->IsOffTheRecord();
@@ skipping 33 matching lines @@
 }
 
 const GURL& IOSChromePasswordManagerClient::GetLastCommittedEntryURL() const {
   return delegate_.lastCommittedURL;
 }
 
 const password_manager::CredentialsFilter*
 IOSChromePasswordManagerClient::GetStoreResultFilter() const {
   return &credentials_filter_;
 }