Revert of Track task ids for navigations cross multiple tabs.

components/sync_sessions/sessions_sync_manager.cc

Index: components/sync_sessions/sessions_sync_manager.cc
diff --git a/components/sync_sessions/sessions_sync_manager.cc b/components/sync_sessions/sessions_sync_manager.cc
index 271ea77e3028fda3ccabedeeb22f387c81c3a25a..f985b3db1e34608ee6d25fbcfa61ec780fb92c79 100644
--- a/components/sync_sessions/sessions_sync_manager.cc
+++ b/components/sync_sessions/sessions_sync_manager.cc
@@ -499,13 +499,9 @@
       tab_specifics->current_navigation_index();
   int64_t current_navigation_global_id =
       tab_specifics->navigation(current_index_in_tab_specifics).global_id();
-  SessionID::id_type source_tab_id = tab_delegate->GetSourceTabID();
 
   TabTasks* tab_tasks =
-      source_tab_id == kInvalidTabID
-          ? task_tracker_->GetTabTasks(tab_delegate->GetSessionId())
-          : task_tracker_->GetTabTasks(tab_delegate->GetSessionId(),
-                                       source_tab_id);
+      task_tracker_->GetTabTasks(tab_delegate->GetSessionId());
   tab_tasks->UpdateWithNavigation(
       current_navigation_index,
       tab_delegate->GetTransitionAtIndex(current_navigation_index),