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This CL converts TextSuggestionBackendPtr in content and
TextSuggestionBackendRequest in blink to the new Mojo types.

Bug: 955171, 978694
Change-Id: I481157d60666e08ed26196cf1c78b54b7fdb1fa1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1777447Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Cr-Commit-Position: refs/heads/master@{#692315}