Change to 72 column reference in git cl upload message

Change to 72 column reference in git cl upload message

76 columns is fine for most patches but reverts will eat another
4 spaces in indentation. For the sake of revert clarity this reference
line is reduced to 72 columns.

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=203530

[alancutter (OOO until 2018), 2013-05-31 05:56:56]

This is an update to https://codereview.chromium.org/15670012/ after feedback.

[Noel Gordon, 2013-05-31 05:57:48]

LGTM thx.

[commit-bot: I haz the power, 2013-06-01 00:22:33]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/alancutter@chromium.org/16152005/1

[commit-bot: I haz the power, 2013-06-01 00:24:14]

Presubmit check for 16152005-1 failed and returned exit status 1.

Running presubmit commit checks ...
Checking out rietveld...
Running save-description-on-failure.sh
Running push-basic.sh
Running upstream.sh
Running submit-from-new-dir.sh
Running abandon.sh
Running submodule-merge-test.sh
Running upload-local-tracking-branch.sh
Running hooks.sh
Running post-dcommit-hook-test.sh
Running upload-stale.sh
Running patch.sh
Running basic.sh

** Presubmit ERRORS **
Missing LGTM from an OWNER for these files:
    depot_tools/git_cl.py
    depot_tools/tests/git_cl_test.py

Presubmit checks took 99.6s to calculate.

[M-A Ruel, 2013-06-01 00:32:54]

lgtm

[commit-bot: I haz the power, 2013-06-01 00:32:56]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/alancutter@chromium.org/16152005/1

[commit-bot: I haz the power, 2013-06-01 00:34:38]

Change committed as 203530