Protocol handlers should be able to register a service worker.

content/public/browser/content_browser_client.cc

 // Copyright (c) 2012 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/public/browser/content_browser_client.h"
 
 #include "base/files/file_path.h"
 #include "content/public/browser/client_certificate_delegate.h"
 #include "content/public/common/sandbox_type.h"
 #include "ui/gfx/image/image_skia.h"
@@ skipping 47 matching lines @@
     bool in_memory,
     ProtocolHandlerMap* protocol_handlers,
     URLRequestInterceptorScopedVector request_interceptors) {
   return nullptr;
 }
 
 bool ContentBrowserClient::IsHandledURL(const GURL& url) {
   return false;
 }
 
+GURL ContentBrowserClient::GetHandlerFor(BrowserContext* browser_context,
+    const GURL& url) {
+  return GURL::EmptyGURL();
+}
+
 bool ContentBrowserClient::CanCommitURL(RenderProcessHost* process_host,
                                         const GURL& site_url) {
   return true;
 }
 
 bool ContentBrowserClient::IsIllegalOrigin(ResourceContext* resource_context,
                                            int child_process_id,
                                            const GURL& origin) {
   return false;
 }
@@ skipping 300 matching lines @@
 #if defined(VIDEO_HOLE)
 ExternalVideoSurfaceContainer*
 ContentBrowserClient::OverrideCreateExternalVideoSurfaceContainer(
     WebContents* web_contents) {
   NOTREACHED() << "Hole-punching is not supported. See crbug.com/469348.";
   return nullptr;
 }
 #endif
 
 }  // namespace content