Revert "[libFuzzer] Port to Windows"

This reverts r340949 due to bot breakage again.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk/lib/fuzzer@340954 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/FuzzerUtilWindows.cpp b/FuzzerUtilWindows.cpp
index 257723b..8227e77 100644
--- a/FuzzerUtilWindows.cpp
+++ b/FuzzerUtilWindows.cpp
@@ -179,9 +179,7 @@
 }
 
 std::string DisassembleCmd(const std::string &FileName) {
-  Vector<std::string> command_vector;
-  command_vector.push_back("dumpbin /summary > nul");
-  if (ExecuteCommand(Command(command_vector)) == 0)
+  if (ExecuteCommand("dumpbin /summary > nul") == 0)
     return "dumpbin /disasm " + FileName;
   Printf("libFuzzer: couldn't find tool to disassemble (dumpbin)\n");
   exit(1);