Coalesce more hardcoded schemes to using predefined constants.

chrome/browser/extensions/extension_protocols.cc

 // Copyright (c) 2006-2008 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 "chrome/browser/extensions/extension_protocols.h"
 
 #include "base/string_util.h"
 #include "chrome/browser/extensions/extension.h"
 #include "chrome/browser/net/chrome_url_request_context.h"
+#include "chrome/common/url_constants.h"
 #include "googleurl/src/url_util.h"
 #include "net/base/net_util.h"
 #include "net/url_request/url_request_file_job.h"
 
-// Defined in extension.h.
-extern const char kExtensionURLScheme[];
-extern const char kUserScriptURLScheme[];
-
 // Factory registered with URLRequest to create URLRequestJobs for extension://
 // URLs.
 static URLRequestJob* CreateExtensionURLRequestJob(URLRequest* request,
                                                    const std::string& scheme) {
   ChromeURLRequestContext* context =
       static_cast<ChromeURLRequestContext*>(request->context());
 
   // chrome-extension://extension-id/resource/path.js
   FilePath directory_path = context->GetPathForExtension(request->url().host());
   if (directory_path.value().empty())
@@ skipping 16 matching lines @@
   FilePath directory_path = context->user_script_dir_path();
   std::string resource = request->url().path();
 
   FilePath path = Extension::GetResourcePath(directory_path, resource);
   return new URLRequestFileJob(request, path);
 }
 
 void RegisterExtensionProtocols() {
   // Being a standard scheme allows us to resolve relative paths. This is used
   // by extensions, but not by standalone user scripts.
-  url_util::AddStandardScheme(kExtensionURLScheme);
+  url_util::AddStandardScheme(chrome::kExtensionScheme);
 
-  URLRequest::RegisterProtocolFactory(kExtensionURLScheme,
+  URLRequest::RegisterProtocolFactory(chrome::kExtensionScheme,
                                       &CreateExtensionURLRequestJob);
-  URLRequest::RegisterProtocolFactory(kUserScriptURLScheme,
+  URLRequest::RegisterProtocolFactory(chrome::kUserScriptScheme,
                                       &CreateUserScriptURLRequestJob);
 }