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This refactors the three implementations across //content's ppapi_plugin,
renderer, and utility into a single implementation in child. No intended
behavior change.

Change-Id: Icebe662f6d6855bd4f00f103691267e5db7e92ff
Reviewed-on: https://chromium-review.googlesource.com/c/1356026Reviewed-by: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613145}