This reverts commit fc132e61.

Reason for revert: Causes all presubmit checks to return dirty
format because of a non-zero diff output.

Original change's description:
> git-cl: Fix format --dry-run not working with --full.
> 
> The --full option would skip setting the return value of the format
> command when used with --dry-run. This in turn would cause the
> presubmit check to always pass when --full was enabled in a repo by
> default.
> 
> Was discovered in the ANGLE repository.
> 
> Bug: angleproject:4241
> Change-Id: Ie6cb423a6818c1e26781d77938a0dd22c02b4c16
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1987835
> Commit-Queue: Jamie Madill <jmadill@chromium.org>
> Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
> Auto-Submit: Jamie Madill <jmadill@chromium.org>

TBR=ehmaldonado@chromium.org,jmadill@chromium.org

Change-Id: I0a4c51117ab20606f6dbb1f7a3ba40f87da1e939
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: angleproject:4241
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1993907Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>