Revert "Revert 182527" ([Sync] Make SESSIONS an implicit type)

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 603 matching lines @@
 extern const char kSyncTypedUrls[];
 extern const char kSyncExtensions[];
 extern const char kSyncExtensionSettings[];
 extern const char kSyncHistoryDeleteDirectives[];
 extern const char kSyncDictionary[];
 extern const char kSyncManaged[];
 extern const char kSyncSearchEngines[];
 extern const char kSyncSessions[];
 extern const char kSyncSuppressStart[];
 extern const char kSyncSyncedNotifications[];
+extern const char kSyncTabs[];
 extern const char kGoogleServicesLastUsername[];
 extern const char kGoogleServicesUsername[];
 extern const char kGoogleServicesUsernamePattern[];
 extern const char kSyncUsingSecondaryPassphrase[];
 extern const char kSyncEncryptionBootstrapToken[];
 extern const char kSyncKeystoreEncryptionBootstrapToken[];
 extern const char kSyncAcknowledgedSyncTypes[];
 // Deprecated in favor of kInvalidatorMaxInvalidationVersions.
 extern const char kSyncMaxInvalidationVersions[];
 extern const char kSyncSessionsGUID[];
@@ skipping 225 matching lines @@
 #if defined(OS_CHROMEOS)
 extern const char kRLZBrand[];
 extern const char kRLZDisabled[];
 #endif
 
 extern const char kAppListProfile[];
 
 }  // namespace prefs
 
 #endif  // CHROME_COMMON_PREF_NAMES_H_