Remove PDFium SAX fuzzer

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}

pdf/pdfium/fuzzers/BUILD.gn

@@ -31,7 +31,6 @@ group("pdf_fuzzers") {
   if (pdf_enable_xfa) {
     deps += [
       ":pdf_cfx_barcode_fuzzer",
-      ":pdf_cfx_saxreader_fuzzer",
       ":pdf_codec_bmp_fuzzer",
       ":pdf_codec_gif_fuzzer",
       ":pdf_codec_jpeg_fuzzer",
@@ -242,14 +241,6 @@ if (pdf_enable_xfa) {
     ]
   }
 
-  fuzzer_test("pdf_cfx_saxreader_fuzzer") {
-    sources = []
-    deps = [
-      "//third_party/pdfium/testing/libfuzzer:pdf_cfx_saxreader_fuzzer",
-    ]
-    dict = "dicts/pdf_xml.dict"
-  }
-
   fuzzer_test("pdfium_xfa_fuzzer") {
     sources = [
       "pdfium_fuzzer_helper.cc",