Make extensions developer mode adhere to policy

chrome/browser/extensions/api/developer_private/developer_private_api.h

Index: chrome/browser/extensions/api/developer_private/developer_private_api.h
diff --git a/chrome/browser/extensions/api/developer_private/developer_private_api.h b/chrome/browser/extensions/api/developer_private/developer_private_api.h
index ecc6b05ddd3507c6c918e35d2f05dd20086db18b..488fe9c078af961c3d138171a86cb1a4fa2750c8 100644
--- a/chrome/browser/extensions/api/developer_private/developer_private_api.h
+++ b/chrome/browser/extensions/api/developer_private/developer_private_api.h
@@ -122,7 +122,7 @@ class DeveloperPrivateEventRouter : public ExtensionRegistryObserver,
   void ExtensionWarningsChanged(
       const ExtensionIdSet& affected_extensions) override;
 
-  // Handles a profile preferance change.
+  // Handles a profile preference change.

[Andrew T Wilson (Slow), 2016/12/04 14:54:54]

This is fine, but in general I don't like to pull in files to a CL just to fix
typos. If you're already in the file, then OK, but to only add the file to fix a
typo is something I usually avoid (drive a separate CL for that if you really
want to fix typos).

[pmarko, 2016/12/07 16:12:11]

This was more of an accident - I was adding something in here which I later
reverted due to reviewers' feedback but forgot to revert the comment change.
I'll take this out as it pollutes the file list :)

   void OnProfilePrefChanged();
 
   // Broadcasts an event to all listeners.