[Sync] Fix namespaces for the sync_sessions component.

components/sync_sessions/tab_node_pool.h

Index: components/sync_sessions/tab_node_pool.h
diff --git a/components/sync_sessions/tab_node_pool.h b/components/sync_sessions/tab_node_pool.h
index d4c4a652cdd7e56b0f47466834153731cfe62e1c..e7ba5b06788d4ad76b9f48d988f3546c7b8f4108 100644
--- a/components/sync_sessions/tab_node_pool.h
+++ b/components/sync_sessions/tab_node_pool.h
@@ -19,7 +19,7 @@ namespace syncer {
 class SyncChangeProcessor;
 }
 
-namespace browser_sync {
+namespace sync_sessions {
 
 // A pool for managing free/used tab sync nodes for the *local* session.
 // Performs lazy creation of sync nodes when necessary.
@@ -159,6 +159,6 @@ class TabNodePool {
   DISALLOW_COPY_AND_ASSIGN(TabNodePool);
 };
 
-}  // namespace browser_sync
+}  // namespace sync_sessions
 
 #endif  // COMPONENTS_SYNC_SESSIONS_TAB_NODE_POOL_H_