Add TitledUrlIndex for indexing arbitrary title/URL pairs

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 5eb625fa88ff6f94ffd38ca8b203a288cff611e9..6e2cf1c99cd0f244dc587a368a03cdc297ce8bfb 100644
--- a/components/bookmarks/browser/bookmark_client.h
+++ b/components/bookmarks/browser/bookmark_client.h
@@ -32,12 +32,12 @@ class BookmarkPermanentNode;
 // e.g. Chrome.
 class BookmarkClient {
  public:
-  // Types representing a set of BookmarkNode and a mapping from BookmarkNode
-  // to the number of time the corresponding URL has been typed by the user in
+  // Types representing a set of BookmarkNodes and a mapping from BookmarkNode
+  // to the number of times the corresponding URL has been typed by the user in
   // the Omnibox.
-  typedef std::set<const BookmarkNode*> NodeSet;
-  typedef std::pair<const BookmarkNode*, int> NodeTypedCountPair;
-  typedef std::vector<NodeTypedCountPair> NodeTypedCountPairs;
+  using NodeSet = std::set<const BookmarkNode*>;
+  using NodeTypedCountPair = std::pair<const BookmarkNode*, int>;
+  using NodeTypedCountPairs = std::vector<NodeTypedCountPair>;
 
   virtual ~BookmarkClient() {}