Revert of Task Manager Should remember the most recently enabled columns.

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 458 matching lines @@
 
 extern const char kUninstallMetricsPageLoadCount[];
 extern const char kUninstallLastLaunchTimeSec[];
 extern const char kUninstallLastObservedRunTimeSec[];
 
 extern const char kBrowserSuppressDefaultBrowserPrompt[];
 
 extern const char kBrowserWindowPlacement[];
 extern const char kBrowserWindowPlacementPopup[];
 extern const char kTaskManagerWindowPlacement[];
-extern const char kTaskManagerColumnVisibility[];
 extern const char kAppWindowPlacement[];
 
 extern const char kDownloadDefaultDirectory[];
 extern const char kDownloadExtensionsToOpen[];
 extern const char kDownloadDirUpgraded[];
 #if defined(OS_WIN) || defined(OS_LINUX) || \
     (defined(OS_MACOSX) && !defined(OS_IOS))
 extern const char kOpenPdfDownloadInSystemReader[];
 #endif
 
@@ skipping 319 matching lines @@
 
 #if defined(ENABLE_EXTENSIONS)
 extern const char kAnimationPolicy[];
 #endif
 
 extern const char kBackgroundTracingLastUpload[];
 
 }  // namespace prefs
 
 #endif  // CHROME_COMMON_PREF_NAMES_H_