This CL replaces std::string user_id in ash/* with AccountId.

chrome/browser/feedback/show_feedback_page.cc

 // 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.
 
 #include <string>
 
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/api/feedback_private/feedback_private_api.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/ash/multi_user/multi_user_util.h"
 #include "chrome/browser/ui/ash/multi_user/multi_user_window_manager.h"
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "components/signin/core/account_id/account_id.h"
 #include "content/public/browser/web_contents.h"
 #include "url/gurl.h"
 
 namespace {
 
 GURL GetTargetTabUrl(int session_id, int index) {
   Browser* browser = chrome::FindBrowserWithID(session_id);
   // Sanity checks.
   if (!browser || index >= browser->tab_strip_model()->count())
     return GURL();
@@ skipping 33 matching lines @@
   }
 
   // We do not want to launch on an OTR profile.
   profile = profile->GetOriginalProfile();
   DCHECK(profile);
 
 #if defined(OS_CHROMEOS)
   // Obtains the display profile ID on which the Feedback window should show.
   chrome::MultiUserWindowManager* const window_manager =
       chrome::MultiUserWindowManager::GetInstance();
-  const std::string display_profile_id =
+  const AccountId display_account_id =
       window_manager && browser
           ? window_manager->GetUserPresentingWindow(
                 browser->window()->GetNativeWindow())
-          : "";
-  profile = display_profile_id.empty()
-                ? profile
-                : multi_user_util::GetProfileFromUserID(display_profile_id);
+          : EmptyAccountId();
+  profile = display_account_id.is_valid()
+                ? multi_user_util::GetProfileFromAccountId(display_account_id)
+                : profile;
 #endif
 
   extensions::FeedbackPrivateAPI* api =
       extensions::FeedbackPrivateAPI::GetFactoryInstance()->Get(profile);
 
   api->RequestFeedback(description_template,
                        category_tag,
                        page_url);
 }
 
 }  // namespace chrome