Revert "Auto merge of #7103 - frewsxcv:python-venv, r=metajack" for breaking web-platform-tests.

This reverts commit c315404db8, reversing
changes made to b00583bd4e.

python/mach_bootstrap.py

@@ -6,9 +6,7 @@ from __future__ import print_function, unicode_literals
 
 import os
 import platform
-import subprocess
 import sys
-from distutils.spawn import find_executable
 
 SEARCH_PATHS = [
     "python/mach",
@@ -75,39 +73,6 @@ CATEGORIES = {
 }
 
 
-def _get_exec(name, default=None):
-    path = find_executable(name)
-    if not path:
-        return default
-    return path
-
-
-def _activate_virtualenv(topdir):
-    virtualenv_path = os.path.join(topdir, "python", "_virtualenv")
-    python = _get_exec("python2", "python")
-
-    if not os.path.exists(virtualenv_path):
-        virtualenv = _get_exec("virtualenv2", "virtualenv")
-        subprocess.check_call([virtualenv, "-p", python, virtualenv_path])
-
-    activate_path = os.path.join(virtualenv_path, "bin", "activate_this.py")
-    execfile(activate_path, dict(__file__=activate_path))
-
-    # TODO: Right now, we iteratively install all the requirements by invoking
-    # `pip install` each time. If it were the case that there were conflicting
-    # requirements, we wouldn't know about them. Once
-    # https://github.com/pypa/pip/issues/988 is addressed, then we can just
-    # chain each of the requirements files into the same `pip install` call
-    # and it will check for conflicts.
-    requirements_paths = [
-        os.path.join(topdir, "python", "requirements.txt"),
-        os.path.join(topdir, "tests", "wpt", "harness", "requirements.txt"),
-        os.path.join(topdir, "tests", "wpt", "harness", "requirements_servo.txt"),
-    ]
-    for path in requirements_paths:
-        subprocess.check_call(["pip", "install", "-q", "-r", path])
-
-
 def bootstrap(topdir):
     topdir = os.path.abspath(topdir)
 
@@ -119,8 +84,6 @@ def bootstrap(topdir):
         print('You are running Python', platform.python_version())
         sys.exit(1)
 
-    _activate_virtualenv(topdir)
-
     def populate_context(context, key=None):
         if key is None:
             return