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

chrome/common/cloud_print/cloud_print_helpers.cc

Index: chrome/common/cloud_print/cloud_print_helpers.cc
diff --git a/chrome/common/cloud_print/cloud_print_helpers.cc b/chrome/common/cloud_print/cloud_print_helpers.cc
index 9a2a00a431fd3b74e51f1dbd55a6ba9affc399f2..0092b9f6f7362d5cf6cd6ea40ece291389347076 100644
--- a/chrome/common/cloud_print/cloud_print_helpers.cc
+++ b/chrome/common/cloud_print/cloud_print_helpers.cc
@@ -51,7 +51,7 @@ std::string HashPrinterTags(const PrinterTags& printer_tags) {
 
 std::string AppendPathToUrl(const GURL& url, const std::string& path) {
   DCHECK_NE(path[0], '/');
-  std::string ret = url.path();
+  std::string ret = url.path().as_string();
   if (url.has_path() && (ret.back() != '/'))
     ret += '/';
   ret += path;