Make json defaults file human-readable.

BUG=None
TEST=None

Change-Id: I75f94b3c29e7eebe001bfaca798172244fb60e55
Reviewed-on: https://chrome-internal-review.googlesource.com/221016
Reviewed-by: Han Shen <shenhan@google.com>
Tested-by: Caroline Tice <cmtice@google.com>
Commit-Queue: Caroline Tice <cmtice@google.com>
2 files changed