Get chrome:// dev tool urls hooked up in content_shell.

chrome/common/url_constants.h

 // 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.
 
 // Contains constants for known URLs and portions thereof.
 
 #ifndef CHROME_COMMON_URL_CONSTANTS_H_
 #define CHROME_COMMON_URL_CONSTANTS_H_
 #pragma once
 
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 // "Debug" pages which are dangerous and not for general consumption.
 extern const char* const kChromeDebugURLs[];
 extern int kNumberOfChromeDebugURLs;
 
 // Canonical schemes you can use as input to GURL.SchemeIs().
 extern const char kExtensionScheme[];
 #if defined(OS_CHROMEOS)
 extern const char kGDataScheme[];
 #endif  // defined(OS_CHROMEOS)
 
-// Call near the beginning of startup to register Chrome's internal URLs that
-// should be parsed as "standard" with the googleurl library.
-void RegisterChromeSchemes();
-
 #if defined(OS_CHROMEOS)
 // "Learn more" URL for the Cloud Print section under Options.
 extern const char kCloudPrintLearnMoreURL[];
 #endif
 
 }  // namespace chrome
 
 #endif  // CHROME_COMMON_URL_CONSTANTS_H_