bookmarks: Move BookmarkNode into 'bookmarks' namespace.

components/bookmarks/browser/bookmark_client.h

Index: components/bookmarks/browser/bookmark_client.h
diff --git a/components/bookmarks/browser/bookmark_client.h b/components/bookmarks/browser/bookmark_client.h
index b620b7be828016887fe60e6432689d5e3ae6145a..3ea0269cface46c0d34da06088515e635f1c517a 100644
--- a/components/bookmarks/browser/bookmark_client.h
+++ b/components/bookmarks/browser/bookmark_client.h
@@ -16,8 +16,6 @@
 #include "components/favicon_base/favicon_types.h"
 #include "components/keyed_service/core/keyed_service.h"
 
-class BookmarkNode;
-class BookmarkPermanentNode;
 class GURL;
 
 namespace base {
@@ -26,6 +24,9 @@ struct UserMetricsAction;
 
 namespace bookmarks {
 
+class BookmarkNode;
+class BookmarkPermanentNode;
+
 // This class abstracts operations that depends on the embedder's environment,
 // e.g. Chrome.
 class BookmarkClient : public KeyedService {