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Per discussion with rockot and others, StructTraits and typemap files are
language specific and should live in public/cpp instead of public/interfaces.

Change-Id: Id7fb1f5e733f6b2913f0da2332062c72f386ebab
Reviewed-on: https://chromium-review.googlesource.com/596751
Commit-Queue: Saman Sami <samans@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491770}