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

components/sync/driver/sync_stopped_reporter.cc

Index: components/sync/driver/sync_stopped_reporter.cc
diff --git a/components/sync/driver/sync_stopped_reporter.cc b/components/sync/driver/sync_stopped_reporter.cc
index ba5fbc8928ff04654c6ee666e0a9c80c9f450b65..425e7b085391901b740e75a7fc66edc07adf2ae6 100644
--- a/components/sync/driver/sync_stopped_reporter.cc
+++ b/components/sync/driver/sync_stopped_reporter.cc
@@ -98,7 +98,7 @@ void SyncStoppedReporter::OnTimeout() {
 
 // Static.
 GURL SyncStoppedReporter::GetSyncEventURL(const GURL& sync_service_url) {
-  std::string path = sync_service_url.path();
+  std::string path = sync_service_url.path().as_string();
   if (path.empty() || *path.rbegin() != '/') {
     path += '/';
   }