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

content/common/service_worker/service_worker_utils.cc

Index: content/common/service_worker/service_worker_utils.cc
diff --git a/content/common/service_worker/service_worker_utils.cc b/content/common/service_worker/service_worker_utils.cc
index 9abc85887f4f96efa7262190628d00748468f5a1..ccf39273a06169343032a82ee707c4706b0592c4 100644
--- a/content/common/service_worker/service_worker_utils.cc
+++ b/content/common/service_worker/service_worker_utils.cc
@@ -16,7 +16,7 @@ namespace content {
 namespace {
 
 bool PathContainsDisallowedCharacter(const GURL& url) {
-  std::string path = url.path();
+  base::StringPiece path = url.path();
   DCHECK(base::IsStringUTF8(path));
 
   // We should avoid these escaped characters in the path component because
@@ -65,16 +65,16 @@ bool ServiceWorkerUtils::IsPathRestrictionSatisfied(
       error_message->append("') was received when fetching the script.");
       return false;
     }
-    max_scope_string = max_scope.path();
+    max_scope_string = max_scope.path().as_string();
   } else {
-    max_scope_string = script_url.Resolve(".").path();
+    max_scope_string = script_url.Resolve(".").path().as_string();
   }
 
-  std::string scope_string = scope.path();
+  base::StringPiece scope_string = scope.path();
   if (!base::StartsWith(scope_string, max_scope_string,
                         base::CompareCase::SENSITIVE)) {
     *error_message = "The path of the provided scope ('";
-    error_message->append(scope_string);
+    error_message->append(scope_string.as_string());
     error_message->append("') is not under the max scope allowed (");
     if (service_worker_allowed_header_value)
       error_message->append("set by Service-Worker-Allowed: ");