Delete dead code for CurrentlyOpenTabs

chrome/common/pref_names.h

 // 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.
 
 // Constants for the names of various preferences, for easier changing.
 
 #ifndef CHROME_COMMON_PREF_NAMES_H_
 #define CHROME_COMMON_PREF_NAMES_H_
 
 #include <stddef.h>
@@ skipping 532 matching lines @@
 extern const char kRestartLastSessionOnShutdown[];
 #if !defined(OS_ANDROID)
 extern const char kSuppressUnsupportedOSWarning[];
 extern const char kWasRestarted[];
 #endif
 
 extern const char kDisableExtensions[];
 extern const char kDisablePluginFinder[];
 
 extern const char kNtpAppPageNames[];
-#if BUILDFLAG(ANDROID_JAVA_UI)
-extern const char kNtpCollapsedCurrentlyOpenTabs[];
-#endif
 extern const char kNtpCollapsedForeignSessions[];
 #if BUILDFLAG(ANDROID_JAVA_UI)
 extern const char kNtpCollapsedRecentlyClosedTabs[];
 extern const char kNtpCollapsedSnapshotDocument[];
 extern const char kNtpCollapsedSyncPromo[];
 #endif
 extern const char kNtpShownPage[];
 
 extern const char kDevToolsAdbKey[];
 extern const char kDevToolsDisabled[];
@@ skipping 298 matching lines @@
 extern const char kSearchGeolocationDisclosureDismissed[];
 extern const char kSearchGeolocationDisclosureShownCount[];
 extern const char kSearchGeolocationDisclosureLastShowDate[];
 extern const char kSearchGeolocationPreDisclosureMetricsRecorded[];
 extern const char kSearchGeolocationPostDisclosureMetricsRecorded[];
 #endif
 
 }  // namespace prefs
 
 #endif  // CHROME_COMMON_PREF_NAMES_H_