Andrew Overton 755a10e3be [NavigationDrawer] Add NavigationDrawer theming target to podspec
When the source files for the NavigationDrawer theming extension were added the podspec wasn't updated. This change updates the podspec and renames an incorrectly-named file.

Closes https://github.com/material-components/material-components-ios/pull/9996

COPYBARA_INTEGRATE_REVIEW=https://github.com/material-components/material-components-ios/pull/9996 from andrewoverton:update-navigationdrawer-theming-target 44389e5dd73b5fdb4cfd5f9651ed36e9ad638570
PiperOrigin-RevId: 312270981
2020-05-19 06:56:59 -07:00
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