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Removes build files and json files no longer needed.

BUG=763529
TEST=none

Change-Id: I2926af9e461e1178ec63b0f0c1e1368d4dc26d51
Reviewed-on: https://chromium-review.googlesource.com/701258
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506924}