PyAuto: minor cleanup

Remove 2 redundant lines.


Review URL: http://codereview.chromium.org/2810032

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@50904 0039d316-1c4b-4281-b951-d872f2087c98

chrome/test/pyautolib/pyauto.py

@@ -647,8 +647,6 @@ class PyUITest(pyautolib.PyUITestBase, unittest.TestCase):
       all_data = f.read()
       f.close()
       return all_data
-    except IOError:
-      raise
     finally:
       shutil.rmtree(tempdir)