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This CL implements a GstaticJsonFetcher that actually connects to
gstatic to fetch the JSON files.

Bug: 1001291
Change-Id: I5dcb34e1ea10b8ab6a80343d73757de5bd08da37
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1825484
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700421}