git cl: temporary stop using project~number on Gerrit.

Broke release process.

R=ehmaldonado, mmoss

Bug: 876964, 876910
Change-Id: I02ea424632f5c5522af0010adce1c993e2610b48
Reviewed-on: https://chromium-review.googlesource.com/1187548
Reviewed-by: Michael Moss <mmoss@chromium.org>
Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>

git_cl.py

@@ -2419,8 +2419,10 @@ class _GerritChangelistImpl(_ChangelistCodereviewBase):
 
     Not to be confused by value of "Change-Id:" footer.
     """
-    return gerrit_util.ChangeIdentifier(
-        self._GetGerritProject(), self.GetIssue())
+    # TODO(tandrii): undo this once a fix is in place for crbug/876964.
+    # return gerrit_util.ChangeIdentifier(
+    #     self._GetGerritProject(), self.GetIssue())
+    return str(self.GetIssue())
 
   @classmethod
   def IssueConfigKey(cls):

tests/git_cl_test.py

@@ -1327,7 +1327,7 @@ class TestGitCl(TestCase):
     if squash:
       calls += [
           (('AddReviewers',
-            'chromium-review.googlesource.com', 'my%2Frepo~123456',
+            'chromium-review.googlesource.com', '123456',
             sorted(reviewers),
             ['joe@example.com', 'chromium-reviews+test-more-cc@chromium.org'] +
             cc, notify), ''),
@@ -1351,7 +1351,7 @@ class TestGitCl(TestCase):
           }),
         (('SetReview',
           'chromium-review.googlesource.com',
-          'my%2Frepo~123456',
+          '123456',
           'Self-approving for TBR',
           {'Code-Review': 2}, None), ''),
       ]