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Also I've manually pruned the corpus because it was too large (170k+ files).
That should reanimate the fuzzer + dictionary might be useful for JSON.

R=aizatsky@chromium.org, inferno@chromium.org, jochen@chromium.org, krasin@chromium.org
BUG=584819
TBR=aizatsky@chromium.org

Review URL: https://codereview.chromium.org/1808203002

Cr-Commit-Position: refs/heads/master@{#381707}