Eliminate redundancy in the parameters to NotifyEntryChanged.

content/browser/frame_host/navigation_entry_impl.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_NAVIGATION_ENTRY_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATION_ENTRY_IMPL_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_vector.h"
@@ skipping 32 matching lines @@
 
     // Ref counted pointer that keeps the FrameNavigationEntry alive as long as
     // it is needed by this node's NavigationEntry.
     scoped_refptr<FrameNavigationEntry> frame_entry;
 
     // List of child TreeNodes, which will be deleted when this node is.
     ScopedVector<TreeNode> children;
   };
 
   static NavigationEntryImpl* FromNavigationEntry(NavigationEntry* entry);
+  static const NavigationEntryImpl* FromNavigationEntry(
+      const NavigationEntry* entry);
 
   // The value of bindings() before it is set during commit.
   static int kInvalidBindings;
 
   NavigationEntryImpl();
   NavigationEntryImpl(SiteInstanceImpl* instance,
                       int page_id,
                       const GURL& url,
                       const Referrer& referrer,
                       const base::string16& title,
@@ skipping 369 matching lines @@
   // persisted, unless specific data is taken out/put back in at save/restore
   // time (see TabNavigation for an example of this).
   std::map<std::string, base::string16> extra_data_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationEntryImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATION_ENTRY_IMPL_H_