Move BookmarkStorage into bookmarks namespace.

components/bookmarks/browser/bookmark_storage.cc

Index: components/bookmarks/browser/bookmark_storage.cc
diff --git a/components/bookmarks/browser/bookmark_storage.cc b/components/bookmarks/browser/bookmark_storage.cc
index f8a20de3434cac03d8fe8724688487529727b4b4..38d6579d8733df2671344a8b2b97d69046814bf6 100644
--- a/components/bookmarks/browser/bookmark_storage.cc
+++ b/components/bookmarks/browser/bookmark_storage.cc
@@ -20,6 +20,8 @@
 
 using base::TimeTicks;
 
+namespace bookmarks {
+
 namespace {
 
 // Extension used for backup files (copy of main file created during startup).
@@ -185,3 +187,5 @@ bool BookmarkStorage::SaveNow() {
   writer_.WriteNow(data);
   return true;
 }
+
+}  // namespace bookmarks