[WIP] make GURL::path() return a StringPiece

net/url_request/url_request_file_job.cc

Index: net/url_request/url_request_file_job.cc
diff --git a/net/url_request/url_request_file_job.cc b/net/url_request/url_request_file_job.cc
index 8f96f404c9125dfb37c090b06d2ac1810fdde2bf..a8567f0f25ee334322f63f05482c783d260ba366 100644
--- a/net/url_request/url_request_file_job.cc
+++ b/net/url_request/url_request_file_job.cc
@@ -114,7 +114,7 @@ bool URLRequestFileJob::IsRedirectResponse(GURL* location,
   if (meta_info_.is_directory) {
     // This happens when we discovered the file is a directory, so needs a
     // slash at the end of the path.
-    std::string new_path = request_->url().path();
+    std::string new_path = request_->url().path().as_string();
     new_path.push_back('/');
     GURL::Replacements replacements;
     replacements.SetPathStr(new_path);