[libFuzzer] get rid of UserSuppliedFuzzer; NFC

llvm-svn: 260798
diff --git a/llvm/lib/Fuzzer/test/FuzzerUnittest.cpp b/llvm/lib/Fuzzer/test/FuzzerUnittest.cpp
index 5213280..06ab510 100644
--- a/llvm/lib/Fuzzer/test/FuzzerUnittest.cpp
+++ b/llvm/lib/Fuzzer/test/FuzzerUnittest.cpp
@@ -403,9 +403,9 @@
 
 TEST(Corpus, Distribution) {
   Random Rand(0);
-  SimpleUserSuppliedFuzzer USF(&Rand, LLVMFuzzerTestOneInput);
+  MutationDispatcher MD(Rand);
   Fuzzer::FuzzingOptions Options;
-  Fuzzer Fuzz(USF, Options);
+  Fuzzer Fuzz(LLVMFuzzerTestOneInput, MD, Options);
   size_t N = 10;
   size_t TriesPerUnit = 1<<20;
   for (size_t i = 0; i < N; i++) {