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Data urls are disabled from top-level navigations as of Chrome 60. This will
display the JSON in a floating textarea instead.

Bug: 775599
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I6a66eaf19f005cbf75640db146ea4ca4acf26277
Reviewed-on: https://chromium-review.googlesource.com/724236
Commit-Queue: Cathy Li <chili@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Justin DeWitt <dewittj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513234}