[Sync] Fix namespaces for the sync_sessions component.

components/sync_sessions/revisit/sessions_page_revisit_observer.cc

Index: components/sync_sessions/revisit/sessions_page_revisit_observer.cc
diff --git a/components/sync_sessions/revisit/sessions_page_revisit_observer.cc b/components/sync_sessions/revisit/sessions_page_revisit_observer.cc
index 8c81975dcb33ad3e63be4b94e70ab040ffd9014b..747abd24d80584034b111e7cd33d17767b2cce4b 100644
--- a/components/sync_sessions/revisit/sessions_page_revisit_observer.cc
+++ b/components/sync_sessions/revisit/sessions_page_revisit_observer.cc
@@ -53,9 +53,9 @@ void SessionsPageRevisitObserver::CheckForRevisit(
   CurrentTabMatcher current_matcher(page_equality);
   OffsetTabMatcher offset_matcher(page_equality);
 
-  std::vector<const sync_driver::SyncedSession*> foreign_sessions;
+  std::vector<const SyncedSession*> foreign_sessions;
   if (provider_->GetAllForeignSessions(&foreign_sessions)) {
-    for (const sync_driver::SyncedSession* session : foreign_sessions) {
+    for (const SyncedSession* session : foreign_sessions) {
       for (const std::pair<const SessionID::id_type, sessions::SessionWindow*>&
                key_value : session->windows) {
         for (const sessions::SessionTab* tab : key_value.second->tabs) {