Refactor: Make PyAuto InstallExtension() take a string. Delete dead code.

chrome/test/pyautolib/pyautolib.i

Index: chrome/test/pyautolib/pyautolib.i
diff --git a/chrome/test/pyautolib/pyautolib.i b/chrome/test/pyautolib/pyautolib.i
index e0f5c9a6514dde1b44b02619a5cdafd380d347bb..91d6023038a6342b2304dbec493477d9bfb17d57 100644
--- a/chrome/test/pyautolib/pyautolib.i
+++ b/chrome/test/pyautolib/pyautolib.i
@@ -372,11 +372,11 @@ class PyUITestBase {
                         int tab_index=0);
 
   // Misc methods
-  %feature("docstring", "Install an extension from the given file.  The file "
-           "must be specified with an absolute path. Returns the extension ID "
-           "if successfully installed and loaded. Otherwise, returns the empty "
-           "string.") InstallExtension;
-  std::string InstallExtension(const FilePath& crx_file, bool with_ui);
+  %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;