Move kExtensionScheme from content to chrome

content/common/url_constants.h

 // Copyright (c) 2011 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 CONTENT_COMMON_URL_CONSTANTS_H_
 #define CONTENT_COMMON_URL_CONSTANTS_H_
 #pragma once
 
 #include "content/common/content_export.h"
 
 namespace chrome {
 
-// Null terminated list of schemes that are savable.
-extern const char* kSavableSchemes[];
+// Null terminated list of schemes that are savable. This function can be
+// invoked on any thread.
+const char** GetSavableSchemes();
 
 // Canonical schemes you can use as input to GURL.SchemeIs().
 // TODO(jam): some of these don't below in the content layer, but are accessed
 // from there.
 CONTENT_EXPORT extern const char kAboutScheme[];
 CONTENT_EXPORT extern const char kBlobScheme[];
 CONTENT_EXPORT extern const char kChromeDevToolsScheme[];
 CONTENT_EXPORT extern const char kChromeInternalScheme[];
 CONTENT_EXPORT extern const char kChromeUIScheme[];  // Used for WebUIs.
 CONTENT_EXPORT extern const char kCrosScheme[];      // Used for ChromeOS.
 CONTENT_EXPORT extern const char kDataScheme[];
-CONTENT_EXPORT extern const char kExtensionScheme[];
 CONTENT_EXPORT extern const char kFileScheme[];
 CONTENT_EXPORT extern const char kFileSystemScheme[];
 CONTENT_EXPORT extern const char kFtpScheme[];
 CONTENT_EXPORT extern const char kHttpScheme[];
 CONTENT_EXPORT extern const char kHttpsScheme[];
 CONTENT_EXPORT extern const char kJavaScriptScheme[];
 CONTENT_EXPORT extern const char kMailToScheme[];
 CONTENT_EXPORT extern const char kMetadataScheme[];
 CONTENT_EXPORT extern const char kViewSourceScheme[];
 
 // Used to separate a standard scheme and the hostname: "://".
 CONTENT_EXPORT extern const char kStandardSchemeSeparator[];
 
 // About URLs (including schemes).
 CONTENT_EXPORT extern const char kAboutBlankURL[];
 CONTENT_EXPORT extern const char kAboutCrashURL[];
 
 // Special URL used to start a navigation to an error page.
 extern const char kUnreachableWebDataURL[];
 
+// Call near the beginning of startup to register the content layer's internal
+// URLs that should be parsed as "standard" with the googleurl library. The
+// embedder can pass a 0-terminated list of additional schemes that should be
+// savable, or NULL if the standard list is sufficient.
+void CONTENT_EXPORT RegisterContentSchemes(
+    const char** additional_savable_schemes);
+
 }  // namespace chrome
 
 #endif  // CONTENT_COMMON_URL_CONSTANTS_H_