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

chrome/test/pyautolib/pyautolib.h

Index: chrome/test/pyautolib/pyautolib.h
diff --git a/chrome/test/pyautolib/pyautolib.h b/chrome/test/pyautolib/pyautolib.h
index fc22f22569d11a104242f89363d2d7f792689878..1c2182714c505be1ff14c18e3e06be984287dc0e 100644
--- a/chrome/test/pyautolib/pyautolib.h
+++ b/chrome/test/pyautolib/pyautolib.h
@@ -122,10 +122,10 @@ class PyUITestBase : public UITestBase {
   // Fetch the number of browser windows. Includes popups.
   int GetBrowserWindowCount();
 
-  // Installs the extension crx.  Returns the extension ID only if the extension
+  // Installs the extension.  Returns the extension ID only if the extension
   // was installed and loaded successfully.  Otherwise, returns the empty
   // string.  Overinstalls will fail.
-  std::string InstallExtension(const FilePath& crx_file, bool with_ui);
+  std::string InstallExtension(const std::string& extension_path, bool with_ui);
 
   // Returns bookmark bar visibility state.
   bool GetBookmarkBarVisibility();