Service Worker: Expand path restriction error message to instruct how to fix

content/browser/service_worker/service_worker_utils.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/service_worker/service_worker_utils.h"
 
 #include <string>
 
 #include "base/logging.h"
 #include "base/strings/string_util.h"
@@ skipping 59 matching lines @@
 
   std::string scope_string = scope.path();
   if (!StartsWithASCII(scope_string, max_scope_string, true)) {
     *error_message = "The path of the provided scope ('";
     error_message->append(scope_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: ");
     error_message->append("'");
     error_message->append(max_scope_string);
-    error_message->append("').");
+    error_message->append(
+        "'). Adjust the scope, move the Service Worker script, or use the "
+        "Service-Worker-Allowed HTTP header to allow the scope.");
     return false;
   }
   return true;
 }
 
 // static
 bool ServiceWorkerUtils::ContainsDisallowedCharacter(
     const GURL& scope,
     const GURL& script_url,
     std::string* error_message) {
@@ skipping 13 matching lines @@
   if (!ServiceWorkerUtils::ScopeMatches(scope, url_))
     return false;
   if (match_.is_empty() || match_.spec().size() < scope.spec().size()) {
     match_ = scope;
     return true;
   }
   return false;
 }
 
 }  // namespace content