Re-create devtools client upon browser restart

telemetry/telemetry/internal/backends/chrome/desktop_browser_backend.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 datetime
 import glob
 import heapq
 import logging
 import os
 import os.path
@@ skipping 303 matching lines @@
       self._proc = subprocess.Popen(args, env=env)
 
     try:
       self._WaitForBrowserToComeUp()
       # browser is foregrounded by default on Windows and Linux, but not Mac.
       if self.browser.platform.GetOSName() == 'mac':
         subprocess.Popen([
             'osascript', '-e',
             ('tell application "%s" to activate' % self._executable)
         ])
-      self._InitDevtoolsClientBackend()
       if self._supports_extensions:
         self._WaitForExtensionsToLoad()
     except:
       self.Close()
       raise
 
   @property
   def pid(self):
     if self._proc:
       return self._proc.pid
@@ skipping 322 matching lines @@
         shutil.rmtree(self._tmp_profile_dir, ignore_errors=True)
         self._tmp_profile_dir = None
 
     if self._tmp_output_file:
       self._tmp_output_file.close()
       self._tmp_output_file = None
 
     if self._tmp_minidump_dir:
       shutil.rmtree(self._tmp_minidump_dir, ignore_errors=True)
       self._tmp_minidump_dir = None