OOPIF: Fix subframe back/forward after recreating FTNs (try #2).

content/browser/frame_host/frame_tree_node.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_NODE_H_
 #define CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_NODE_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 80 matching lines @@
   }
 
   int frame_tree_node_id() const {
     return frame_tree_node_id_;
   }
 
   const std::string& frame_name() const {
     return replication_state_.name;
   }
 
+  const std::string& unique_name() const {
+    return replication_state_.unique_name;
+  }
+
   size_t child_count() const {
     return children_.size();
   }
 
   FrameTreeNode* parent() const { return parent_; }
 
   FrameTreeNode* opener() const { return opener_; }
 
   // Assigns a new opener for this node and, if |opener| is non-null, registers
   // an observer that will clear this node's opener if |opener| is ever
@@ skipping 235 matching lines @@
   base::ObserverList<Observer> observers_;
 
   base::TimeTicks last_focus_time_;
 
   DISALLOW_COPY_AND_ASSIGN(FrameTreeNode);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_NODE_H_