Verify signed .crx extension installations

chrome/common/extensions/extension_unpacker.h

 // Copyright (c) 2009 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_EXTENSION_UNPACKER_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_UNPACKER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 30 matching lines @@
   static bool ReadImagesFromFile(const FilePath& extension_path,
                                  DecodedImages* images);
 
   const std::string& error_message() { return error_message_; }
   DictionaryValue* parsed_manifest() {
     return parsed_manifest_.get();
   }
   const DecodedImages& decoded_images() { return decoded_images_; }
 
  private:
-  // Parse the header on the front of the extension file and return the manifest
-  // inside it. Caller takes ownership of return value.
-  DictionaryValue* ReadPackageHeader();
-
   // Parse the manifest.json file inside the extension (not in the header).
   // Caller takes ownership of return value.
   DictionaryValue* ReadManifest();
 
   // Decodes the image at the given path and puts it in our list of decoded
   // images.
   bool AddDecodedImage(const FilePath& path);
 
   // Set the error message.
   void SetError(const std::string& error);
@@ skipping 11 matching lines @@
   // are relative to the manifest file.
   DecodedImages decoded_images_;
 
   // The last error message that was set.  Empty if there were no errors.
   std::string error_message_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionUnpacker);
 };
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_UNPACKER_H_