Telemetry: Remove the class ProfileCreator.

tools/perf/profile_creators/profile_extender.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.
 
-class ProfileCreator(object):
+class ProfileExtender(object):
   """Abstract base class for an object that constructs a Chrome profile."""
 
   def Run(self, options):
-    """Creates the profile.
+    """Creates or extends the profile.
 
     |options| is an instance of BrowserFinderOptions. When subclass
     implementations of this method inevitably attempt to find and launch a
     browser, they should pass |options| to the relevant methods.
 
     Several properties of |options| might require direct manipulation by
     subclasses. These are:
       |options.output_profile_path|: The path at which the profile should be
       created.
       |options.browser_options.profile_dir|: If this property is None, then a
       new profile is created. Otherwise, the existing profile is appended on
       to.
     """
     raise NotImplementedError()