MD History: Hide sign in guide in guest mode

chrome/browser/ui/webui/md_history_ui.cc

 // 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.
 
 #include "chrome/browser/ui/webui/md_history_ui.h"
 
 #include "base/command_line.h"
 #include "build/build_config.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/signin/signin_manager_factory.h"
@@ skipping 83 matching lines @@
               IDS_SETTINGS_CLEAR_DATA_WEB_HISTORY_URL_IN_HISTORY)));
 
   bool allow_deleting_history =
       prefs->GetBoolean(prefs::kAllowDeletingBrowserHistory);
   source->AddBoolean("allowDeletingHistory", allow_deleting_history);
 
   bool group_by_domain = base::CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kHistoryEnableGroupByDomain) || profile->IsSupervised();
   source->AddBoolean("groupByDomain", group_by_domain);
 
+  source->AddBoolean("isGuestSession", profile->IsGuestSession());
+
   SigninManagerBase* signin_manager =
       SigninManagerFactory::GetForProfile(profile);
   bool is_authenticated = signin_manager != nullptr &&
       signin_manager->IsAuthenticated();
   source->AddBoolean("isUserSignedIn", is_authenticated);
 
   source->AddResourcePath("app.html", IDR_MD_HISTORY_APP_HTML);
   source->AddResourcePath("app.js", IDR_MD_HISTORY_APP_JS);
   source->AddResourcePath("browser_service.html",
                           IDR_MD_HISTORY_BROWSER_SERVICE_HTML);
@@ skipping 83 matching lines @@
   base::FeatureList::ClearInstanceForTesting();
   base::FeatureList::SetInstance(std::move(feature_list));
 }
 
 // static
 base::RefCountedMemory* MdHistoryUI::GetFaviconResourceBytes(
     ui::ScaleFactor scale_factor) {
   return ResourceBundle::GetSharedInstance().LoadDataResourceBytesForScale(
       IDR_HISTORY_FAVICON, scale_factor);
 }