REF: gradually move ExtensionIndex delegation to use inherit_names
Hello @jbrockmendel! Thanks for updating this PR. We checked the lines you've touched for [PEP 8](https://www.python.org/dev/peps/pep-0008) issues, and found:









There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers: 

##### Comment last updated at 2020-01-27 19:49:05 UTC Closing to clear the queue, will revisit once indexing fixes are done Are all of these changes appropriate for 1.0.0? Or does it rely on stuff that hasn't been backported? > Are all of these changes appropriate for 1.0.0? Or does it rely on stuff that hasn't been backported?

`inherit_from_data` was in the RC, though this does change that a little bit.  I could do a PR that omits the CategoricalIndex and TimedeltaIndex edits. thanks @jbrockmendel 