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

chrome/browser/tab_contents/tab_contents.h

 // Copyright (c) 2009 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_TAB_CONTENTS_H_
 #define CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_
 
 #include "build/build_config.h"
 
 #include <map>
@@ skipping 556 matching lines @@
   }
 
   void CrossSiteNavigationCanceled() {
     render_manager_.CrossSiteNavigationCanceled();
   }
 
   void WindowMoveOrResizeStarted() {
     render_view_host()->WindowMoveOrResizeStarted();
   }
 
+  // Marks that the current navigation resulted in download.
+  void MarkAsDownload();
+
  private:
   friend class NavigationController;
   // Used to access the child_windows_ (ConstrainedWindowList) for testing
   // automation purposes.
   friend class AutomationProvider;
 
   FRIEND_TEST(TabContentsTest, UpdateTitle);
 
   // Temporary until the view/contents separation is complete.
   friend class TabContentsView;
@@ skipping 497 matching lines @@
   // True if the user has decided to block future javascript messages. This is
   // reset on navigations to false on navigations.
   bool suppress_javascript_messages_;
 
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(TabContents);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_