Submitting http://codereview.chromium.org/73075 on behalf of shinichiro.hamaj...

base/file_util_win.cc

Index: base/file_util_win.cc
===================================================================
--- base/file_util_win.cc	(revision 13742)
+++ base/file_util_win.cc	(working copy)
@@ -14,6 +14,7 @@
 #include "base/logging.h"
 #include "base/scoped_handle.h"
 #include "base/string_util.h"
+#include "base/time.h"
 #include "base/win_util.h"
 
 namespace file_util {
@@ -39,12 +40,14 @@
   return true;
 }
 
-int CountFilesCreatedAfter(const std::wstring& path,
-                           const FILETIME& comparison_time) {
+int CountFilesCreatedAfter(const FilePath& path,
+                           const base::Time& comparison_time) {
   int file_count = 0;
+  FILETIME comparison_filetime(comparison_time.ToFileTime());
 
   WIN32_FIND_DATA find_file_data;
-  std::wstring filename_spec = path + L"\\*";  // All files in given dir
+  // All files in given dir
+  std::wstring filename_spec = path.Append(L"*").value();
   HANDLE find_handle = FindFirstFile(filename_spec.c_str(), &find_file_data);
   if (find_handle != INVALID_HANDLE_VALUE) {
     do {
@@ -54,7 +57,7 @@
         continue;
 
       long result = CompareFileTime(&find_file_data.ftCreationTime,
-                                    &comparison_time);
+                                    &comparison_filetime);
       // File was created after or on comparison time
       if ((result == 1) || (result == 0))
         ++file_count;