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

chrome/renderer/extensions/webstore_bindings.cc

Index: chrome/renderer/extensions/webstore_bindings.cc
diff --git a/chrome/renderer/extensions/webstore_bindings.cc b/chrome/renderer/extensions/webstore_bindings.cc
index 5fd175a5f6ea863b9999df4e3d7dff8fb0cc4a40..ea82cbd3015a4085b95cb49f4c75f36721bc8bc7 100644
--- a/chrome/renderer/extensions/webstore_bindings.cc
+++ b/chrome/renderer/extensions/webstore_bindings.cc
@@ -163,8 +163,10 @@ bool WebstoreBindings::GetWebstoreItemIdFromFrame(
       return false;
     }
 
-    std::string candidate_webstore_item_id = webstore_url.path().substr(
-        webstore_base_url.path().length());
+    std::string candidate_webstore_item_id =
+        webstore_url.path()
+            .substr(webstore_base_url.path().length())
+            .as_string();
     if (!crx_file::id_util::IdIsValid(candidate_webstore_item_id)) {
       *error = kInvalidWebstoreItemUrlError;
       return false;