Move CrxFile, FileReader, ExtensionResource to src/extensions.

extensions/common/crx_file.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.
 
-#ifndef CHROME_BROWSER_EXTENSIONS_CRX_FILE_H_
-#define CHROME_BROWSER_EXTENSIONS_CRX_FILE_H_
+#ifndef EXTENSIONS_COMMON_CRX_FILE_H_
+#define EXTENSIONS_COMMON_CRX_FILE_H_
 
 #include <sys/types.h>
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 
 namespace extensions {
 
 // CRX files have a header that includes a magic key, version number, and
 // some signature sizing information. Use CrxFile object to validate whether
 // the header is valid or not.
@@ skipping 49 matching lines @@
   // Constructor is private. Clients should use static factory methods above.
   explicit CrxFile(const Header& header);
 
   // Checks the |header| for validity and returns true if the values are valid.
   // If false is returned, more detailed error code is returned in |error|.
   static bool HeaderIsValid(const Header& header, Error* error);
 };
 
 }  // namespace extensions
 
-#endif  // CHROME_BROWSER_EXTENSIONS_CRX_FILE_H_
+#endif  // EXTENSIONS_COMMON_CRX_FILE_H_