Prevent extension sideloading from Windows registry

extensions/common/extension.cc

 // Copyright (c) 2013 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 "extensions/common/extension.h"
 
 #include "base/base64.h"
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ skipping 49 matching lines @@
   // Extensions are cross-platform.
   // Since FilePath uses backslash '\\' as file path separator on Windows, so we
   // need to check manually.
   if (path.value().find('\\') != path.value().npos)
     return true;
   return !net::IsSafePortableRelativePath(path);
 }
 
 }  // namespace
 
-const int Extension::kInitFromValueFlagBits = 12;
+const int Extension::kInitFromValueFlagBits = 13;
 
 const char Extension::kMimeType[] = "application/x-chrome-extension";
 
 const int Extension::kValidWebExtentSchemes =
     URLPattern::SCHEME_HTTP | URLPattern::SCHEME_HTTPS;
 
 const int Extension::kValidHostPermissionSchemes = URLPattern::SCHEME_CHROMEUI |
                                                    URLPattern::SCHEME_HTTP |
                                                    URLPattern::SCHEME_HTTPS |
                                                    URLPattern::SCHEME_FILE |
@@ skipping 698 matching lines @@
 
 UpdatedExtensionPermissionsInfo::UpdatedExtensionPermissionsInfo(
     const Extension* extension,
     const PermissionSet* permissions,
     Reason reason)
     : reason(reason),
       extension(extension),
       permissions(permissions) {}
 
 }   // namespace extensions