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This CL converts PdfToEmfConverterClient, PdfToEmfConverter,
and PdfToEmfConverterFactory to new mojo types using
PendingRemote, Remote. Receiver, and PendingReceiver.

Bug: 955171
Change-Id: I9e76d7b9360856e7f415ec24d408fd9d6a21e227
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1827276Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#704010}