Enforce the 'requirements' field in manifests.

chrome/browser/extensions/sandboxed_unpacker.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_SANDBOXED_UNPACKER_H_
 #define CHROME_BROWSER_EXTENSIONS_SANDBOXED_UNPACKER_H_
 
 #include <string>
 
 #include "base/file_path.h"
@@ skipping 18 matching lines @@
   // extension_root - The path to the extension root inside of temp_dir.
   //
   // original_manifest - The parsed but unmodified version of the manifest,
   // with no modifications such as localization, etc.
   //
   // extension - The extension that was unpacked. The client is responsible
   // for deleting this memory.
   virtual void OnUnpackSuccess(const FilePath& temp_dir,
                                const FilePath& extension_root,
                                const base::DictionaryValue* original_manifest,
-                               const Extension* extension) = 0;
+                               Extension* extension) = 0;
   virtual void OnUnpackFailure(const string16& error) = 0;
 
  protected:
   friend class base::RefCountedThreadSafe<SandboxedUnpackerClient>;
 
   virtual ~SandboxedUnpackerClient() {}
 };
 
 // SandboxedUnpacker unpacks extensions from the CRX format into a
 // directory. This is done in a sandboxed subprocess to protect the browser
@@ skipping 174 matching lines @@
   Extension::Location location_;
 
   // Creation flags to use for the extension.  These flags will be used
   // when calling Extenion::Create() by the crx installer.
   int creation_flags_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_SANDBOXED_UNPACKER_H_