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TBR=marq@chromium.org

This fixes a BUILD issue due to a deprecated API in MDCSnackbarManager.

Bug: 1117399
Change-Id: I27a9c5ce03e319bb4f402236d32f593a4d7f073e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2367032Reviewed-by: Nohemi Fernandez <fernandex@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Nohemi Fernandez <fernandex@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800084}