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The fuzzer will now check that recanonicalizing a GURL spec string
returns the original spec. This CL also adds some inputs from the linked
bug to the fuzzer's dict.

Bug: 1128999
Change-Id: I8143fd027eaa3a084f913f49f4b13b2b499880b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414615
Commit-Queue: Dan McArdle <dmcardle@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809069}