Description: do not rely on the dirmd tool that is not part of the source tarball
(see https://chromium.googlesource.com/chromium/src/+/aea3e89fb1730a63ae4b99b4e7169f9e15ab96b5)
--- a/tools/metrics/histograms/expand_owners.py
+++ b/tools/metrics/histograms/expand_owners.py
@@ -400,8 +400,3 @@
         continue
 
       _UpdateHistogramOwners(histogram, owner, owners_to_add)
-
-      component = _ExtractComponentViaDirmd(os.path.dirname(path))
-      if component and component not in components_with_dom_elements:
-        components_with_dom_elements.add(component)
-        _AddHistogramComponent(histogram, component)