sync: disable the mistakenly enabled sessions code.

chrome/browser/sync/profile_sync_factory_impl.cc

 // Copyright (c) 2010 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.
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "chrome/browser/defaults.h"
 #include "chrome/browser/profile.h"
 #include "chrome/browser/sync/glue/app_data_type_controller.h"
 #include "chrome/browser/sync/glue/autofill_change_processor.h"
@@ skipping 117 matching lines @@
         new ThemeDataTypeController(this, profile_, pss));
   }
 
   // TypedUrl sync is disabled by default.  Register only if
   // explicitly enabled.
   if (command_line_->HasSwitch(switches::kEnableSyncTypedUrls)) {
     pss->RegisterDataTypeController(
         new TypedUrlDataTypeController(this, profile_, pss));
   }
 
-  // Session sync is enabled by default.  Register unless explicitly
-  // disabled.
-  if (!command_line_->HasSwitch(switches::kDisableSyncSessions)) {
+  // Session sync is disabled by default.  Register only if explicitly
+  // enabled.
+  if (command_line_->HasSwitch(switches::kEnableSyncSessions)) {
     pss->RegisterDataTypeController(
         new SessionDataTypeController(this, pss));
   }
   return pss;
 }
 
 DataTypeManager* ProfileSyncFactoryImpl::CreateDataTypeManager(
     SyncBackendHost* backend,
     const DataTypeController::TypeMap& controllers) {
   return new DataTypeManagerImpl(backend, controllers);
@@ skipping 115 matching lines @@
 ProfileSyncFactoryImpl::CreateSessionSyncComponents(
     ProfileSyncService* profile_sync_service,
     UnrecoverableErrorHandler* error_handler) {
   SessionModelAssociator* model_associator =
       new SessionModelAssociator(profile_sync_service);
   SessionChangeProcessor* change_processor =
       new SessionChangeProcessor(error_handler, model_associator);
   return SyncComponents(model_associator, change_processor);
 }