Explicitly add issue trackers to list of forums where Code of Conduct applies.

CODE_OF_CONDUCT.md

 # Chromium Code of Conduct
 
 Google and the Chromium team are committed to preserving and fostering a
 diverse, welcoming community. Below is our community code of conduct, which
-applies to our repos and organizations, mailing lists, blog content, and any
-other Chromium-supported communication group, as well as any private
-communication initiated in the context of these spaces.
+applies to our repos and organizations, issue trackers, mailing lists,
+blog content, and any other Chromium-supported communication group, as
+well as any private communication initiated in the context of these
+spaces.
 
 Simply put, community discussions should be
 
  * respectful and kind;
  * about Chromium;
  * about features and code, not the individuals involved.
 
 ## Be respectful and constructive.
 
 Treat everyone with respect. Build on each other's ideas. Each of us has the
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 ## Acknowledgements
 
 This Code of Conduct is based on the Geek Feminism Code of Conduct, the Django
 Code of Conduct and the Geek Feminism Wiki "Effective codes of conduct" guide.
 
 ## License
 
 This Code of Conduct is available for reuse under the Creative Commons Zero
 (CC0) license.