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Previous version of fuzzer used std::string, which in
C++11 nul-terminates, but actual caller expects
base::StringPiece which does not. This failed to catch
an overflow bug, so switch to using base::StringPiece.
Also revert "base_json_reader_fuzzer: Sanitizer-poison memory around the input buffer."
since the change is unneeded.

This reverts commit 845bbd0e.

R=rsesek@chromium.org

Change-Id: I8abffc3f2931818711119406effa685b1d368659
Reviewed-on: https://chromium-review.googlesource.com/959564
Commit-Queue: Abhishek Arya <inferno@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542623}