Revert "depot_tools: Add httplib2 to .vpython"

This reverts commit e1410883.

Reason for revert: 
This appears to have broken Skia's Presubmit:
https://chromium-swarm.appspot.com/task?id=47d11ff76d07a610

Original change's description:
> depot_tools: Add httplib2 to .vpython
> 
> Check that things won't break before further changes are made.
> 
> Bug: 1002153
> Change-Id: I41866f26334bf9ec2732bc0f25007234a95130e4
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1854749
> Auto-Submit: Edward Lesmes <ehmaldonado@chromium.org>
> Commit-Queue: Andrii Shyshkalov <tandrii@google.com>
> Reviewed-by: Andrii Shyshkalov <tandrii@google.com>

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

Change-Id: Ie73c4172c349ea0c22cad399f4ef948b9486e028
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1002153
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1855590Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>

.vpython

 python_version: "2.7"
-
-wheel: <
-  name: "infra/python/wheels/httplib2-py2_py3"
-  version: "version:0.10.3"
->

auth.py

@@ -9,7 +9,6 @@ from __future__ import print_function
 import collections
 import datetime
 import functools
-import httplib2
 import json
 import logging
 import optparse
@@ -21,6 +20,7 @@ import urlparse
 
 import subprocess2
 
+from third_party import httplib2
 from third_party.oauth2client import client
 
 

tests/auth_test.py

@@ -7,7 +7,6 @@
 
 import __builtin__
 import datetime
-import httplib2
 import json
 import logging
 import os
@@ -19,6 +18,7 @@ sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 
 from testing_support import auto_stub
+from third_party import httplib2
 from third_party import mock
 
 import auth