Remove the flag --disable-hide-inactive-stacked-tab-close-buttons

chrome/browser/flag_descriptions.h

 // Copyright 2017 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.
 
 #ifndef CHROME_BROWSER_FLAG_DESCRIPTIONS_H_
 #define CHROME_BROWSER_FLAG_DESCRIPTIONS_H_
 
 // Includes needed for macros allowing conditional compilation of some strings.
 #include "build/build_config.h"
 #include "build/buildflag.h"
@@ skipping 360 matching lines @@
 extern const char kGpuRasterizationName[];
 extern const char kGpuRasterizationDescription[];
 extern const char kForceGpuRasterization[];
 
 extern const char kGoogleProfileInfoName[];
 extern const char kGoogleProfileInfoDescription[];
 
 extern const char kHarfbuzzRendertextName[];
 extern const char kHarfbuzzRendertextDescription[];
 
-extern const char kHideInactiveStackedTabCloseButtonsName[];
-extern const char kHideInactiveStackedTabCloseButtonsDescription[];
-
 extern const char kHistoryRequiresUserGestureName[];
 extern const char kHistoryRequiresUserGestureDescription[];
 extern const char kHyperlinkAuditingName[];
 extern const char kHyperlinkAuditingDescription[];
 
 extern const char kHostedAppQuitNotificationName[];
 extern const char kHostedAppQuitNotificationDescription[];
 
 extern const char kHostedAppShimCreationName[];
 extern const char kHostedAppShimCreationDescription[];
@@ skipping 1131 matching lines @@
 #endif  // defined(TOOLKIT_VIEWS) || defined(OS_ANDROID)
 
 // ============================================================================
 // Don't just add flags to the end, put them in the right section in
 // alphabetical order. See top instructions for more.
 // ============================================================================
 
 }  // namespace flag_descriptions
 
 #endif  // CHROME_BROWSER_FLAG_DESCRIPTIONS_H_