Change URL back to the previous one if the typed URL causes file download....

chrome/browser/tab_contents/navigation_entry.h

 // Copyright (c) 2006-2008 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 CHROME_BROWSER_TAB_CONTENTS_NAVIGATION_ENTRY_H_
 #define CHROME_BROWSER_TAB_CONTENTS_NAVIGATION_ENTRY_H_
 
 #include "base/basictypes.h"
 #include "base/scoped_ptr.h"
 #include "base/string_util.h"
@@ skipping 105 matching lines @@
     int security_bits_;
     int content_status_;
 
     // Copy and assignment is explicitly allowed for this class.
   };
 
   // The type of the page an entry corresponds to.  Used by tests.
   enum PageType {
     NORMAL_PAGE = 0,
     ERROR_PAGE,
-    INTERSTITIAL_PAGE
+    INTERSTITIAL_PAGE,
+    DOWNLOAD_PAGE,
   };
 
   // Favicon -------------------------------------------------------------------
 
   // Collects the favicon related information for a NavigationEntry.
   class FaviconStatus {
    public:
     FaviconStatus();
 
     // Indicates whether we've gotten an official favicon for the page, or are
@@ skipping 262 matching lines @@
   // This is a cached version of the result of GetTitleForDisplay. It prevents
   // us from having to do URL formatting on the URL evey time the title is
   // displayed. When the URL, display URL, or title is set, this should be
   // cleared to force a refresh.
   string16 cached_display_title_;
 
   // Copy and assignment is explicitly allowed for this class.
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_NAVIGATION_ENTRY_H_