Bug 1786948: Remove dead code from the moz.yaml schema validation r=jewilde

Differential Revision: https://phabricator.services.mozilla.com/D155596

python/mozbuild/mozbuild/vendor/moz_yaml.py

@@ -361,42 +361,6 @@ def load_moz_yaml(filename, verify=True, require_license_file=True):
     return manifest
 
 
-def update_moz_yaml(filename, release, revision, verify=True, write=True):
-    """Update origin:release and vendoring:revision without stripping
-    comments or reordering fields."""
-
-    if verify:
-        load_moz_yaml(filename)
-
-    lines = []
-    with open(filename) as f:
-        found_release = False
-        found_revision = False
-        section = None
-        for line in f.readlines():
-            m = RE_SECTION(line)
-            if m:
-                section = m.group(1)
-            else:
-                m = RE_FIELD(line)
-                if m:
-                    (name, value) = m.groups()
-                    if section == "origin" and name == "release":
-                        line = "  release: %s\n" % release
-                        found_release = True
-                    elif section == "origin" and name == "revision":
-                        line = "  revision: %s\n" % revision
-                        found_revision = True
-            lines.append(line)
-
-        if not found_release and found_revision:
-            raise ValueError("Failed to find origin:release and " "origin:revision")
-
-    if write:
-        with open(filename, "w") as f:
-            f.writelines(lines)
-
-
 def _schema_1():
     """Returns Voluptuous Schema object."""
     return Schema(
@@ -579,10 +543,6 @@ def _schema_1_additional(filename, manifest, require_license_file=True):
         if not has_schema:
             raise ValueError("Not simple YAML")
 
-    # Verify YAML can be updated.
-    if "vendor" in manifest:
-        update_moz_yaml(filename, "", "", verify=False, write=True)
-
 
 # Do type conversion for the few things that need it.
 # Everythig is parsed as a string to (a) not cause problems with revisions that