Remove SWIGged use of BrowserProxy and TabProxy from PyAuto tests.

chrome/test/functional/doc_viewing.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 import os
 
 import pyauto_functional  # must be imported before pyauto
 
 import chromeos.file_browser
@@ skipping 41 matching lines @@
                                                                        fname))
         file_browser = self._GetFullPageFileBrowser()
         self.assertTrue(file_browser, msg='File browser failed to initialize.')
         self.assertTrue(file_browser.Select(fname),
                         msg='"%s" does not exist.' % fname)
         file_browser.ExecuteDefaultTask()
         self.assertTrue(self.WaitUntil(self.GetActiveTabTitle,
                         expect_retval=fname),
                         msg='"%s" does not open.' % fname)
         # Close the document viewing tab after use.
-        self.GetBrowserWindow(0).GetTab(1).Close(True)
+        self.CloseTab(tab_index=1)
 
 
 if __name__ == '__main__':
   pyauto_functional.Main()