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

storage/browser/fileapi/file_system_url_request_job_factory.cc

Index: storage/browser/fileapi/file_system_url_request_job_factory.cc
diff --git a/storage/browser/fileapi/file_system_url_request_job_factory.cc b/storage/browser/fileapi/file_system_url_request_job_factory.cc
index f2481b5a896fcd79cc097d295b81ed560914383a..273357552420106127de5ca2e51005654eeabb6a 100644
--- a/storage/browser/fileapi/file_system_url_request_job_factory.cc
+++ b/storage/browser/fileapi/file_system_url_request_job_factory.cc
@@ -47,7 +47,7 @@ FileSystemProtocolHandler::~FileSystemProtocolHandler() {}
 
 net::URLRequestJob* FileSystemProtocolHandler::MaybeCreateJob(
     net::URLRequest* request, net::NetworkDelegate* network_delegate) const {
-  const std::string path = request->url().path();
+  const base::StringPiece path = request->url().path();
 
   // If the path ends with a /, we know it's a directory. If the path refers
   // to a directory and gets dispatched to FileSystemURLRequestJob, that class