bookmarks: Move BookmarkNode into 'bookmarks' namespace.

components/bookmarks/browser/bookmark_node.cc

Index: components/bookmarks/browser/bookmark_node.cc
diff --git a/components/bookmarks/browser/bookmark_node.cc b/components/bookmarks/browser/bookmark_node.cc
index cd9fe0e8c090593e1540c16c252c6c903f798730..f1a7945d31ecd052c9f88f6059b2be0239d2c86a 100644
--- a/components/bookmarks/browser/bookmark_node.cc
+++ b/components/bookmarks/browser/bookmark_node.cc
@@ -10,6 +10,8 @@
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 
+namespace bookmarks {
+
 namespace {
 
 // Whitespace characters to strip from bookmark titles.
@@ -133,3 +135,5 @@ BookmarkPermanentNode::~BookmarkPermanentNode() {
 bool BookmarkPermanentNode::IsVisible() const {
   return visible_ || !empty();
 }
+
+}  // namespace bookmarks