Port flush_cache tool.

chrome/tools/perf/flush_cache/flush_cache.cc

 // Copyright (c) 2006-2008 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 little program attempts to flush the disk cache for some files.
+// This little program attempts to flush the system cache for some files.
 // It's useful for testing Chrome with a cold database.
 
+#include "base/file_path.h"
 #include "base/string_piece.h"
 #include "base/process_util.h"
 #include "base/sys_string_conversions.h"
 #include "base/test_file_util.h"
 
 int main(int argc, const char* argv[]) {
   base::EnableTerminationOnHeapCorruption();
   if (argc <= 1) {
     fprintf(stderr, "flushes disk cache for files\n");
     fprintf(stderr, "usage: %s <filenames>\n", argv[0]);
     return 1;
   }
 
   for (int i = 1; i < argc; ++i) {
     std::wstring filename = base::SysNativeMBToWide(argv[i]);
-    if (!file_util::EvictFileFromSystemCache(filename.c_str())) {
+    FilePath path = FilePath::FromWStringHack(filename);
+    if (!file_util::EvictFileFromSystemCache(path)) {
       fprintf(stderr, "Failed to evict %s from cache -- is it a directory?\n",
               argv[i]);
     }
   }
 
   return 0;
 }