Revert "presubmit_support: Fix tests on Python 3."

This reverts commit a834f39e213247945fad24605839e2d3c65b0070.

Reason for revert:
https://bugs.chromium.org/p/chromium/issues/detail?id=1017367

Original change's description:
> presubmit_support: Fix tests on Python 3.
>
> Bug: 1009814
> Change-Id: I2c2a835fc4fa0a7fc9e68dfff680fb0beacb491e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1869535
> Reviewed-by: Anthony Polito <apolito@google.com>
> Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>

TBR=ehmaldonado@chromium.org,apolito@google.com

Bug: 1009814
Change-Id: I48907caeca9b9b32e4e3a7cb5a636280d017a4c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1877350
Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
diff --git a/git_cl.py b/git_cl.py
index 4d9ec1a..0415fd4 100755
--- a/git_cl.py
+++ b/git_cl.py
@@ -15,6 +15,7 @@
 import collections
 import datetime
 import glob
+import httplib
 import httplib2
 import itertools
 import json
@@ -29,6 +30,9 @@
 import tempfile
 import textwrap
 import time
+import urllib
+import urllib2
+import urlparse
 import uuid
 import webbrowser
 import zlib
@@ -54,17 +58,6 @@
 import subprocess2
 import watchlists
 
-if sys.version_info.major == 2:
-  import httplib
-  import urllib2 as urllib_request
-  import urllib2 as urllib_error
-  import urlparse
-else:
-  import http.client as httplib
-  import urllib.request as urllib_request
-  import urllib.error as urllib_error
-  import urllib.parse as urlparse
-
 __version__ = '2.0'
 
 # Traces for git push will be stored in a traces directory inside the
@@ -3189,7 +3182,7 @@
   This is necessary because urllib is broken for SSL connections via a proxy.
   """
   with open(destination, 'w') as f:
-    f.write(urllib_request.urlopen(source).read())
+    f.write(urllib2.urlopen(source).read())
 
 
 def hasSheBang(fname):
@@ -4662,7 +4655,7 @@
   'unknown' or 'unset'."""
   url = url or settings.GetTreeStatusUrl(error_ok=True)
   if url:
-    status = urllib_request.urlopen(url).read().lower()
+    status = urllib2.urlopen(url).read().lower()
     if status.find('closed') != -1 or status == '0':
       return 'closed'
     elif status.find('open') != -1 or status == '1':
@@ -4676,7 +4669,7 @@
   with the reason for the tree to be opened or closed."""
   url = settings.GetTreeStatusUrl()
   json_url = urlparse.urljoin(url, '/current?format=json')
-  connection = urllib_request.urlopen(json_url)
+  connection = urllib2.urlopen(json_url)
   status = json.loads(connection.read())
   connection.close()
   return status['message']
@@ -5466,7 +5459,7 @@
     return dispatcher.execute(OptionParser(), argv)
   except auth.LoginRequiredError as e:
     DieWithError(str(e))
-  except urllib_error.HTTPError as e:
+  except urllib2.HTTPError as e:
     if e.code != 500:
       raise
     DieWithError(