Show all mailto: handlers, but dim unavailable ones.

ios/chrome/browser/ui/settings/content_settings_collection_view_controller.mm

 // Copyright 2013 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/content_settings_collection_view_controller.h"
 
 #include "base/logging.h"
 #include "components/content_settings/core/browser/host_content_settings_map.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "components/content_settings/core/common/content_settings_types.h"
@@ skipping 114 matching lines @@
 
 - (void)loadModel {
   [super loadModel];
 
   CollectionViewModel* model = self.collectionViewModel;
   [model addSectionWithIdentifier:SectionIdentifierSettings];
   [model addItem:[self blockPopupsItem]
       toSectionWithIdentifier:SectionIdentifierSettings];
   [model addItem:[self translateItem]
       toSectionWithIdentifier:SectionIdentifierSettings];
-  if (!experimental_flags::IsNativeAppLauncherEnabled() &&
-      [[_mailtoURLRewriter defaultHandlers] count] > 1) {
+  if (!experimental_flags::IsNativeAppLauncherEnabled()) {
     [model addItem:[self composeEmailItem]
         toSectionWithIdentifier:SectionIdentifierSettings];
   }
 }
 
 - (CollectionViewItem*)blockPopupsItem {
   _blockPopupsDetailItem = [[CollectionViewDetailItem alloc]
       initWithType:ItemTypeSettingsBlockPopups];
   NSString* subtitle = [_disablePopupsSetting value]
                            ? l10n_util::GetNSString(IDS_IOS_SETTING_ON)
@@ skipping 99 matching lines @@
 #pragma mark - MailtoURLRewriterObserver
 
 - (void)rewriterDidChange:(MailtoURLRewriter*)rewriter {
   if (rewriter != _mailtoURLRewriter)
     return;
   _composeEmailDetailItem.detailText = [rewriter defaultHandlerName];
   [self reconfigureCellsForItems:@[ _composeEmailDetailItem ]];
 }
 
 @end