[telemetry] Small fixes.

tools/telemetry/build/update_docs.py

 # Copyright 2013 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 logging
 import optparse
 import os
 import pkgutil
 import pydoc
 import re
 import sys
@@ skipping 14 matching lines @@
 
 def RemoveAllStalePycFiles():
   for dirname, _, filenames in os.walk(telemetry_dir):
     for filename in filenames:
       if not filename.endswith('.pyc'):
         continue
       pyc_path = os.path.join(dirname, filename)
       py_path = os.path.splitext(pyc_path)[0] + '.py'
       if not os.path.exists(py_path):
         os.remove(pyc_path)
+        pyc_dir = os.path.dirname(pyc_path)
+        if not os.listdir(pyc_dir):
+          os.removedirs(pyc_dir)
 
 def GenerateHTMLForModule(module):
   html = pydoc.html.page(pydoc.describe(module),
                          pydoc.html.document(module, module.__name__))
 
   # pydoc writes out html with links in a variety of funky ways. We need
   # to fix them up.
   assert not telemetry_dir.endswith(os.sep)
   links = re.findall('(<a href="(.+?)">(.+?)</a>)', html)
   for link_match in links:
@@ skipping 114 matching lines @@
   EnsureTelemetryIsInPath()
   import telemetry
 
   old_cwd = os.getcwd()
   try:
     os.chdir(telemetry_dir)
     for module in GetAllModulesToDocument(telemetry):
       WriteHTMLForModule(module)
   finally:
     os.chdir(old_cwd)