Define kValidUserScriptSchemes in the .h file so that it can be

chrome/common/extensions/user_script.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.
 
 #ifndef CHROME_COMMON_EXTENSIONS_USER_SCRIPT_H_
 #define CHROME_COMMON_EXTENSIONS_USER_SCRIPT_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/file_path.h"
 #include "base/string_piece.h"
 #include "googleurl/src/gurl.h"
 #include "chrome/common/extensions/url_pattern.h"
 #include "chrome/common/extensions/url_pattern_set.h"
 
 class Pickle;
-class URLPattern;
 
 // Represents a user script, either a standalone one, or one that is part of an
 // extension.
 class UserScript {
  public:
   // The file extension for standalone user scripts.
   static const char kFileExtension[];
 
   // The bitmask for valid user script injectable schemes used by URLPattern.
-  static const int kValidUserScriptSchemes;
+  enum {
+    kValidUserScriptSchemes = URLPattern::SCHEME_HTTP |
+                              URLPattern::SCHEME_HTTPS |
+                              URLPattern::SCHEME_FILE |
+                              URLPattern::SCHEME_FTP
+  };
 
   // Check if a URL should be treated as a user script and converted to an
   // extension.
   static bool IsURLUserScript(const GURL& url, const std::string& mime_type);
 
   // Locations that user scripts can be run inside the document.
   enum RunLocation {
     DOCUMENT_START,  // After the documentElemnet is created, but before
                      // anything else happens.
     DOCUMENT_END,  // After the entire document is parsed. Same as
@@ skipping 191 matching lines @@
   // Defaults to false.
   bool match_all_frames_;
 
   // True if the script should be injected into an incognito tab.
   bool incognito_enabled_;
 };
 
 typedef std::vector<UserScript> UserScriptList;
 
 #endif  // CHROME_COMMON_EXTENSIONS_USER_SCRIPT_H_