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To improve security of web downloaded text presented on the dino page
this change makes so that it is base64 encoded before being converted
into a JSON structure. It is later decoded by Javascript before being
inserted into the page.

Bug: 852872
Change-Id: Idb31c53b204762bcf99ad56bbc7bf79e8d500bcc
Reviewed-on: https://chromium-review.googlesource.com/c/1299780
Commit-Queue: Carlos Knippschild <carlosk@chromium.org>
Reviewed-by: Cathy Li <chili@chromium.org>
Reviewed-by: Chris Palmer <palmer@chromium.org>
Reviewed-by: Dan H <harringtond@google.com>
Cr-Commit-Position: refs/heads/master@{#602999}