This reverts commit 9ee86e5a.

Reason for revert: Typo.

Original change's description:
> gerrit-util: Fix GCE check from behind proxy.
> 
> Setting HTTP_PROXY or HTTPS_PROXY environment variables will cause git cl
> to fail.
> 
> The behavior of an unreachable server behind proxy is different from a direct
> connection, it won't throw a httplib2.ServerNotFoundError error,
> so catch httplib2.Httplib2Error instead.
> 
> Bug: 1050380
> Change-Id: I32e2220483de1fd6222c7fd6063039fb86277ef0
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2050947
> Reviewed-by: Anthony Polito <apolito@google.com>
> Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>

TBR=ehmaldonado@chromium.org,apolito@google.com,infra-scoped@luci-project-accounts.iam.gserviceaccount.com

Change-Id: Idb17520e71fc1d892694e0d4d1cf1630a42bb482
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1050380
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2055390Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>