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This CL converts QueryableDataStorePtr and QueryableDataStoreRequest
to new Mojo types.

It uses Remote, PendingReceiver and ReceiverSet instead of
QueryableDataStorePtr, QueryableDataStoreRequest and BindingSet.

Bug: 955171
Change-Id: Iecdac72ae103960845b4764b0513c7ac98a99ade
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1804712Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#697038}