Allow chromedriver to install an extension and get all installed extension IDs.

chrome/test/pyautolib/pyautolib.i

 // Copyright (c) 2011 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.
 //
 // Swig Interface for PyAuto.
 // PyAuto makes the Automation Proxy interface available in Python
 //
 // Running swig as:
 //   swig -python -c++ chrome/test/pyautolib/pyautolib.i
 // would generate pyautolib.py, pyautolib_wrap.cxx
@@ skipping 361 matching lines @@
                  int window_index=0, int tab_index=0);
 
   %feature("docstring", "Get the value of the cookie at cookie_url for the "
            "given window index and tab index. "
            "Returns empty string on error or if there is no value for the "
            "cookie.") GetCookie;
   std::string GetCookie(const GURL& cookie_url, int window_index=0,
                         int tab_index=0);
 
   // Misc methods
-  %feature("docstring", "Install an extension from the given path.  The path "
-           "must be absolute and may be a crx file or an unpacked extension "
-           "directory. Returns the extension ID if successfully installed and "
-           "loaded. Otherwise, returns the empty string.") InstallExtension;
-  std::string InstallExtension(const std::string& extension_path, bool with_ui);
-
   %feature("docstring", "Get a proxy to the browser window at the given "
                         "zero-based index.") GetBrowserWindow;
   scoped_refptr<BrowserProxy> GetBrowserWindow(int window_index);
 
   // Meta-method
   %feature("docstring", "Send a sync JSON request to Chrome.  "
                         "Returns a JSON dict as a response.  "
                         "Given timeout in milliseconds."
                         "Internal method.")
       _SendJSONRequest;
@@ skipping 50 matching lines @@
       GetSyncXmppPort;
   int GetSyncXmppPort() const {
     int val = 0;
     $self->server_data().GetInteger("xmpp_port", &val);
     return val;
   }
 };
 
 }