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This CL removes the PDFium SAX fuzzer as the SAX reader is being removed
from PDFium.

Bug: pdfium:1063
Change-Id: I1b7ac4dcb31b2558471946fdf8023f7944a49c09
Reviewed-on: https://chromium-review.googlesource.com/1007008Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550151}