[Sync] Make SESSIONS an implicit type

chrome/browser/sync/profile_sync_components_factory_impl.cc

Index: chrome/browser/sync/profile_sync_components_factory_impl.cc
diff --git a/chrome/browser/sync/profile_sync_components_factory_impl.cc b/chrome/browser/sync/profile_sync_components_factory_impl.cc
index 752ebaf06a056f065b49294784e82216289daee3..0ff54505ab019c95af169015b5cafe62ee059cb1 100644
--- a/chrome/browser/sync/profile_sync_components_factory_impl.cc
+++ b/chrome/browser/sync/profile_sync_components_factory_impl.cc
@@ -35,6 +35,7 @@
 #include "chrome/browser/sync/glue/password_change_processor.h"
 #include "chrome/browser/sync/glue/password_data_type_controller.h"
 #include "chrome/browser/sync/glue/password_model_associator.h"
+#include "chrome/browser/sync/glue/proxy_data_type_controller.h"
 #include "chrome/browser/sync/glue/search_engine_data_type_controller.h"
 #include "chrome/browser/sync/glue/session_change_processor.h"
 #include "chrome/browser/sync/glue/session_data_type_controller.h"
@@ -67,6 +68,7 @@ using browser_sync::BookmarkChangeProcessor;
 using browser_sync::BookmarkDataTypeController;
 using browser_sync::BookmarkModelAssociator;
 using browser_sync::DataTypeController;
+using browser_sync::DataTypeErrorHandler;
 using browser_sync::DataTypeManager;
 using browser_sync::DataTypeManagerImpl;
 using browser_sync::DataTypeManagerObserver;
@@ -76,6 +78,7 @@ using browser_sync::GenericChangeProcessor;
 using browser_sync::PasswordChangeProcessor;
 using browser_sync::PasswordDataTypeController;
 using browser_sync::PasswordModelAssociator;
+using browser_sync::ProxyDataTypeController;
 using browser_sync::SearchEngineDataTypeController;
 using browser_sync::SessionChangeProcessor;
 using browser_sync::SessionDataTypeController;
@@ -87,7 +90,6 @@ using browser_sync::TypedUrlChangeProcessor;
 using browser_sync::TypedUrlDataTypeController;
 using browser_sync::TypedUrlModelAssociator;
 using browser_sync::UIDataTypeController;
-using browser_sync::DataTypeErrorHandler;
 using content::BrowserThread;
 
 ProfileSyncComponentsFactoryImpl::ProfileSyncComponentsFactoryImpl(
@@ -145,6 +147,8 @@ void ProfileSyncComponentsFactoryImpl::RegisterCommonDataTypes(
   // Session sync is enabled by default.  Register unless explicitly disabled.
   if (!command_line_->HasSwitch(switches::kDisableSyncTabs)) {
     pss->RegisterDataTypeController(
+        new ProxyDataTypeController(syncer::TABS));
+    pss->RegisterDataTypeController(
         new SessionDataTypeController(this, profile_, pss));
   }