Restructure the ipc_fuzzer directory.

tools/ipc_fuzzer/fuzzer/fuzzer_main.cc

 // Copyright 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.
 
 #include <iostream>
 #include <set>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/strings/string_split.h"
 #include "ipc/ipc_message_macros.h"
+#include "tools/ipc_fuzzer/fuzzer/fuzzer.h"
+#include "tools/ipc_fuzzer/fuzzer/generator.h"
+#include "tools/ipc_fuzzer/fuzzer/mutator.h"
+#include "tools/ipc_fuzzer/fuzzer/rand_util.h"
 #include "tools/ipc_fuzzer/message_lib/message_file.h"
-#include "tools/ipc_fuzzer/mutate/fuzzer.h"
-#include "tools/ipc_fuzzer/mutate/generator.h"
-#include "tools/ipc_fuzzer/mutate/mutator.h"
-#include "tools/ipc_fuzzer/mutate/rand_util.h"
 
 namespace ipc_fuzzer {
 
 namespace {
 
 // TODO(mbarbella): Check to see if this value is actually reasonable.
 const int kFrequency = 23;
 
 const char kCountSwitch[] = "count";
 const char kCountSwitchHelp[] =
@@ skipping 209 matching lines @@
   }
 
   return result;
 }
 
 }  // namespace ipc_fuzzer
 
 int main(int argc, char** argv) {
   return ipc_fuzzer::FuzzerMain(argc, argv);
 }