[MDC roll] Roll Material Components to 2a20a6899d0b8c47de26d6a33a12ece09821718a

TBR=smut

Change-Id: I7a5aec9475404019a1ffe91941f53d2190c7477d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1626932Reviewed-by: iOS Autoroller <ios-autoroller@chromium.org>
Commit-Queue: iOS Autoroller <ios-autoroller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662486}

ios/third_party/material_components_ios/README.chromium

 Name: Material Components for iOS
 URL: https://github.com/material-components/material-components-ios
 Version: 0
-Revision: e98ef9c2c9be7e48af15273d4076e730b68fe28e
+Revision: 2a20a6899d0b8c47de26d6a33a12ece09821718a
 License: Apache 2.0
 License File: LICENSE
 Security Critical: yes