Start migrating the disk cache to using FilePath.

net/disk_cache/cache_util_win.cc

Index: net/disk_cache/cache_util_win.cc
diff --git a/net/disk_cache/cache_util_win.cc b/net/disk_cache/cache_util_win.cc
index 3a99836ed7250fa932b2a17b566fb3fb68c0263c..46bffe8f99b7cc60d0a04231604f14675ef1d669 100644
--- a/net/disk_cache/cache_util_win.cc
+++ b/net/disk_cache/cache_util_win.cc
@@ -39,26 +39,34 @@ void DeleteFiles(const wchar_t* path, const wchar_t* search_name) {
 
 namespace disk_cache {
 
-bool MoveCache(const std::wstring& from_path, const std::wstring& to_path) {
+bool MoveCache(const FilePath& from_path, const FilePath& to_path) {
   // I don't want to use the shell version of move because if something goes
   // wrong, that version will attempt to move file by file and fail at the end.
-  if (!MoveFileEx(from_path.c_str(), to_path.c_str(), 0)) {
+  if (!MoveFileEx(from_path.value().c_str(), to_path.value().c_str(), 0)) {
     LOG(ERROR) << "Unable to move the cache: " << GetLastError();
     return false;
   }
   return true;
 }
 
-void DeleteCache(const std::wstring& path, bool remove_folder) {
-  DeleteFiles(path.c_str(), L"*");
+void DeleteCache(const FilePath& path, bool remove_folder) {
+  DeleteFiles(path.value().c_str(), L"*");
   if (remove_folder)
-    RemoveDirectory(path.c_str());
+    RemoveDirectory(path.value().c_str());
 }
 
-bool DeleteCacheFile(const std::wstring& name) {
+bool DeleteCacheFile(const FilePath& name) {
   // We do a simple delete, without ever falling back to SHFileOperation, as the
   // version from base does.
-  return DeleteFile(name.c_str()) ? true : false;
+  return DeleteFile(name.value().c_str()) ? true : false;
+}
+
+void DeleteCache(const std::wstring& path, bool remove_folder) {
+  DeleteCache(FilePath::FromWStringHack(path), remove_folder);
+}
+
+bool DeleteCacheFile(const std::wstring& name) {
+  return DeleteCacheFile(FilePath::FromWStringHack(name));
 }
 
 }  // namespace disk_cache