Move file enumeration to filepaths.

net/disk_cache/cache_util_posix.cc

Index: net/disk_cache/cache_util_posix.cc
===================================================================
--- net/disk_cache/cache_util_posix.cc	(revision 6739)
+++ net/disk_cache/cache_util_posix.cc	(working copy)
@@ -16,9 +16,10 @@
 }
 
 void DeleteCache(const std::wstring& path, bool remove_folder) {
-  file_util::FileEnumerator iter(path, /* recursive */ false,
+  file_util::FileEnumerator iter(FilePath::FromWStringHack(path),
+                                 /* recursive */ false,
                                  file_util::FileEnumerator::FILES);
-  for (std::wstring file = iter.Next(); !file.empty(); file = iter.Next()) {
+  for (FilePath file = iter.Next(); !file.value().empty(); file = iter.Next()) {
     if (!file_util::Delete(file, /* recursive */ false))
       NOTREACHED();
   }