git_cl: Remove support for '--clobber' arg

The chromium recipe (and only the chromium recipe?) currently reads this
prop to trigger a clobber build. But support for that in the recipe is
being removed in https://crrev.com/c/5620860. So this removes the
ability to set that arg via `git cl try`. Across all chrome/chromium
builders, that arg was only passed in six builds in the past year. So
it's very unlikely anyone depends on it, or will notice it's gone.

Bug: 346363294
Change-Id: Icf05c9a2fd6f2e9239c735e4c5507aee9a26e0e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5620634
Reviewed-by: Josip Sokcevic <sokcevic@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>

git_cl.py

@@ -406,8 +406,6 @@ def _make_tryjob_schedule_requests(changelist, jobs, options, patchset):
     shared_properties = {
         'category': options.ensure_value('category', 'git_cl_try')
     }
-    if options.ensure_value('clobber', False):
-        shared_properties['clobber'] = True
     shared_properties.update(_get_properties_from_options(options) or {})
 
     shared_tags = [{'key': 'user_agent', 'value': 'git_cl_try'}]
@@ -2319,7 +2317,7 @@ class Changelist(object):
             if not force:
                 confirm_or_exit(msg, action='continue')
         else:
-          DieWithError(msg)
+            DieWithError(msg)
 
     def EnsureCanUploadPatchset(self, force):
         if not self.GetIssue():
@@ -5723,13 +5721,6 @@ def CMDtry(parser, args):
         help='Revision to use for the tryjob; default: the revision will '
         'be determined by the try recipe that builder runs, which usually '
         'defaults to HEAD of origin/master or origin/main')
-    group.add_option(
-        '-c',
-        '--clobber',
-        action='store_true',
-        default=False,
-        help='Force a clobber before building; that is don\'t do an '
-        'incremental build')
     group.add_option('--category',
                      default='git_cl_try',
                      help='Specify custom build category.')