[Android] Use resource throttle instead of HandleExternalProtocol.

content/public/browser/resource_dispatcher_host_delegate.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/resource_dispatcher_host_delegate.h"
 
 namespace content {
 
 bool ResourceDispatcherHostDelegate::ShouldBeginRequest(
     int child_id,
@@ skipping 39 matching lines @@
   return false;
 }
 
 ResourceDispatcherHostLoginDelegate*
     ResourceDispatcherHostDelegate::CreateLoginDelegate(
         net::AuthChallengeInfo* auth_info,
         net::URLRequest* request) {
   return NULL;
 }
 
-void ResourceDispatcherHostDelegate::HandleExternalProtocol(const GURL& url,
+bool ResourceDispatcherHostDelegate::HandleExternalProtocol(const GURL& url,
                                                             int child_id,
                                                             int route_id) {
+  return true;
 }
 
 bool ResourceDispatcherHostDelegate::ShouldForceDownloadResource(
     const GURL& url,
     const std::string& mime_type) {
   return false;
 }
 
 void ResourceDispatcherHostDelegate::OnResponseStarted(
     net::URLRequest* request,
     ResourceContext* resource_context,
     ResourceResponse* response,
     IPC::Sender* sender) {
 }
 
 void ResourceDispatcherHostDelegate::OnRequestRedirected(
     const GURL& redirect_url,
     net::URLRequest* request,
     ResourceContext* resource_context,
     ResourceResponse* response) {
 }
 
 ResourceDispatcherHostDelegate::ResourceDispatcherHostDelegate() {
 }
 
 ResourceDispatcherHostDelegate::~ResourceDispatcherHostDelegate() {
 }
 
 }  // namespace content