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The coverage builder doesn't run fuzzers anymore, and the corpus has
been turned down, therefore, this CL removes the dependency between
libfuzzer and the fuzzer corpus.

Bug: 990387
Change-Id: I07cbec6629903aa3f2f5b53d3e7692a1e65acca3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1891010Reviewed-by: Max Moroz <mmoroz@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710949}