chore: strip 'master' -> 'main' replacments (#723)

Author: tseaver

packages/google-cloud-ndb/owlbot.py

@@ -69,32 +69,3 @@
 )
 
 s.shell.run(["nox", "-s", "blacken"], hide_output=False)
-
-# ----------------------------------------------------------------------------
-# Main Branch migration
-# ----------------------------------------------------------------------------
-
-s.replace(
-  "*.rst",
-  "master",
-  "main"
-)
-
-s.replace(
-  "*.rst",
-  "google-cloud-python/blob/main",
-  "google-cloud-python/blob/master"
-)
-
-s.replace(
-  "CONTRIBUTING.rst",
-  "kubernetes/community/blob/main",
-  "kubernetes/community/blob/master"
-)
-
-s.replace(
-  ".kokoro/*",
-  "master",
-  "main"
-)
-