Debug the generic session restore failure.

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 674 matching lines @@
 extern const char kCustomHandlersEnabled[];
 
 extern const char kUserCreatedLoginItem[];
 extern const char kUserRemovedLoginItem[];
 extern const char kBackgroundModeEnabled[];
 
 extern const char kDevicePolicyRefreshRate[];
 extern const char kUserPolicyRefreshRate[];
 extern const char kLoadCloudPolicyOnSignin[];
 
+extern const char kSessionRestoreFilesCycled[];
+
 extern const char kRecoveryComponentVersion[];
 extern const char kComponentUpdaterState[];
 
 extern const char kWebIntentsEnabled[];
 
 extern const char kMediaGalleriesUniqueId[];
 extern const char kMediaGalleriesRememberedGalleries[];
 
 #if defined(USE_AURA)
 extern const char kShelfAlignment[];
@@ skipping 23 matching lines @@
 #endif
 
 extern const char kInManagedMode[];
 
 extern const char kNetworkProfileWarningsLeft[];
 extern const char kNetworkProfileLastWarningTime[];
 
 }  // namespace prefs
 
 #endif  // CHROME_COMMON_PREF_NAMES_H_