[Signin iOS] Handle unnamed account in Account Settings screen.

ios/chrome/browser/ui/settings/accounts_collection_view_controller.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/ui/settings/accounts_collection_view_controller.h"
 
 #import "base/ios/weak_nsobject.h"
 #import "base/mac/foundation_util.h"
 #import "base/mac/scoped_nsobject.h"
 #include "base/metrics/user_metrics.h"
@@ skipping 168 matching lines @@
 }
 
 - (void)loadModel {
   // Update the title with the name with the currently signed-in account.
   ChromeIdentity* authenticatedIdentity =
       [self authService]->GetAuthenticatedIdentity();
   NSString* title = nil;
   if (authenticatedIdentity) {
     title = [authenticatedIdentity userFullName];
     if (!title) {
-      // TODO(crbug.com/656994): Figure how to handle unnamed account.
-      title = @"Unnamed account";
+      title = [authenticatedIdentity userEmail];
     }
   }
   self.title = title;
 
   [super loadModel];
 
   if (![self authService]->IsAuthenticated())
     return;
 
   CollectionViewModel* model = self.collectionViewModel;
@@ skipping 467 matching lines @@
       [self.collectionViewModel indexPathForItem:item
                          inSectionWithIdentifier:SectionIdentifierAccounts];
   [self.collectionView reloadItemsAtIndexPaths:@[ indexPath ]];
 }
 
 - (void)onChromeIdentityServiceWillBeDestroyed {
   _identityServiceObserver.reset();
 }
 
 @end