[Sync] Removing complexity around PROXY_TABS now that empty sessions are provided when disabled.

chrome/browser/ui/webui/foreign_session_handler.cc

 // Copyright (c) 2012 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/foreign_session_handler.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <memory>
@@ skipping 219 matching lines @@
 }
 
 void ForeignSessionHandler::OnSyncConfigurationCompleted() {
   HandleGetForeignSessions(nullptr);
 }
 
 void ForeignSessionHandler::OnForeignSessionUpdated() {
   HandleGetForeignSessions(nullptr);
 }
 
-bool ForeignSessionHandler::IsTabSyncEnabled() {
-  Profile* profile = Profile::FromWebUI(web_ui());
-  browser_sync::ProfileSyncService* service =
-      ProfileSyncServiceFactory::GetInstance()->GetForProfile(profile);
-  return service && service->GetActiveDataTypes().Has(syncer::PROXY_TABS);
-}
-
 base::string16 ForeignSessionHandler::FormatSessionTime(
     const base::Time& time) {
   // Return a time like "1 hour ago", "2 days ago", etc.
   base::Time now = base::Time::Now();
   // TimeFormat does not support negative TimeDelta values, so then we use 0.
   return ui::TimeFormat::Simple(
       ui::TimeFormat::FORMAT_ELAPSED, ui::TimeFormat::LENGTH_SHORT,
       now < time ? base::TimeDelta() : now - time);
 }
 
@@ skipping 74 matching lines @@
               BuildWindowData(modification_time, 1));
           window_data->Set("tabs", tab_values.release());
           window_list->Append(std::move(window_data));
         }
       }
 
       session_data->Set("windows", window_list.release());
       session_list.Append(std::move(session_data));
     }
   }
-  base::FundamentalValue tab_sync_enabled(IsTabSyncEnabled());
-  web_ui()->CallJavascriptFunctionUnsafe("setForeignSessions", session_list,
-                                         tab_sync_enabled);
+  web_ui()->CallJavascriptFunctionUnsafe("setForeignSessions", session_list);
 }
 
 void ForeignSessionHandler::HandleOpenForeignSession(
     const base::ListValue* args) {
   size_t num_args = args->GetSize();
   // Expect either 1 or 8 args. For restoring an entire session, only
   // one argument is required -- the session tag. To restore a tab,
   // the additional args required are the window id, the tab id,
   // and 4 properties of the event object (button, altKey, ctrlKey,
   // metaKey, shiftKey) for determining how to open the tab.
@@ skipping 81 matching lines @@
   // collapsed state persists.
   PrefService* prefs = Profile::FromWebUI(web_ui())->GetPrefs();
   DictionaryPrefUpdate update(prefs, prefs::kNtpCollapsedForeignSessions);
   if (is_collapsed)
     update.Get()->SetBoolean(session_tag, true);
   else
     update.Get()->Remove(session_tag, NULL);
 }
 
 }  // namespace browser_sync