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Use the HeapMojoRemote wrapper so that Oilpan will GC the object.

BUG=chromium:1049056

Change-Id: I387365fe5a52180547aa8c1728bc3b6c31cffcc8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2147975
Commit-Queue: Johann Koenig <johannkoenig@google.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762737}