Reland Tab History and BrowserViewController CRWSessionEntry removal.

ios/web/navigation/navigation_item_impl.h

 // Copyright 2014 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 IOS_WEB_NAVIGATION_NAVIGATION_ITEM_IMPL_H_
 #define IOS_WEB_NAVIGATION_NAVIGATION_ITEM_IMPL_H_
 
 #import <Foundation/Foundation.h>
 
 #include <memory>
@@ skipping 101 matching lines @@
   // Removes the header for |key| from |http_request_headers_|.
   void RemoveHttpRequestHeaderForKey(NSString* key);
 
   // Removes all http headers from |http_request_headers_|.
   void ResetHttpRequestHeaders();
 
   // Once a navigation item is committed, we should no longer track
   // non-persisted state, as documented on the members below.
   void ResetForCommit();
 
+  // Returns the title string to be used for a page with |url| if that page
+  // doesn't specify a title.
+  static base::string16 GetDisplayTitleForURL(const GURL& url);
+
  private:
   // The NavigationManItemStorageBuilder functions require access to
   // private variables of NavigationItemImpl.
   friend NavigationItemStorageBuilder;
 
   int unique_id_;
   GURL original_request_url_;
   GURL url_;
   Referrer referrer_;
   GURL virtual_url_;
@@ skipping 27 matching lines @@
 
   // Weak pointer to the facade delegate.
   std::unique_ptr<NavigationItemFacadeDelegate> facade_delegate_;
 
   // Copy and assignment is explicitly allowed for this class.
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_NAVIGATION_NAVIGATION_ITEM_IMPL_H_