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This CL converts DistillerJavaScriptServicePtr and
DistillerJavaScriptServiceRequest to new Mojo types.

It uses Remote and PendingReceiver instead of
DistillerJavaScriptServicePtr and
DistillerJavaScriptServiceRequest.

Bug: 955171
Change-Id: I3ed215819ca30938263d2889f4e668765b7ed59c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1810158Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Ben Greenstein <bengr@chromium.org>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#697866}