Fix pdfium_fuzzer build failure on Windows

testing/libfuzzer/fuzzers/pdfium_fuzzer.cc

 // Copyright (c) 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This fuzzer is simplified & cleaned up pdfium/samples/pdfium_test.cc
 
 #include <assert.h>
 #include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+
+#ifdef _MSC_VER
+#include <Windows.h>
+#else
 #include <unistd.h>
+#endif
 
 #include <list>
 #include <sstream>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "third_party/pdfium/public/fpdf_dataavail.h"
 #include "third_party/pdfium/public/fpdf_ext.h"
 #include "third_party/pdfium/public/fpdf_formfill.h"
@@ skipping 134 matching lines @@
     RenderPage(doc, form, i);
   }
 
   FORM_DoDocumentAAction(form, FPDFDOC_AACTION_WC);
   FPDFDOC_ExitFormFillEnvironment(form);
   FPDF_CloseDocument(doc);
   FPDFAvail_Destroy(pdf_avail);
 }
 
 std::string ProgramPath() {
+#ifdef _MSC_VER
+  wchar_t wpath[MAX_PATH];
+  char path[MAX_PATH];
+  DWORD res = GetModuleFileName(NULL, wpath, MAX_PATH);
+  assert(res != 0);
+  wcstombs(path, wpath, MAX_PATH);
+  return std::string(path, res);
+#else
   char *path = new char[PATH_MAX + 1];
   assert(path);
   ssize_t sz = readlink("/proc/self/exe", path, PATH_MAX);
   assert(sz > 0);
   std::string result(path, sz);
   delete[] path;
   return result;
+#endif
 }
 
 struct TestCase {
   TestCase() {
     InitializeV8ForPDFium(ProgramPath(), "", &natives_blob, &snapshot_blob,
         &platform);
 
     memset(&config, '\0', sizeof(config));
     config.version = 2;
     config.m_pUserFontPaths = nullptr;
@@ skipping 13 matching lines @@
   FPDF_LIBRARY_CONFIG config;
   UNSUPPORT_INFO unsupport_info;
 };
 
 static TestCase* testCase = new TestCase();
 
 extern "C" int LLVMFuzzerTestOneInput(const unsigned char* data, size_t size) {
   RenderPdf(reinterpret_cast<const char*>(data), size);
   return 0;
 }