Re-land 125247: Better error messages when using unsupported manifest features.

chrome/common/extensions/manifest.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_COMMON_EXTENSIONS_MANIFEST_H_
 #define CHROME_COMMON_EXTENSIONS_MANIFEST_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 64 matching lines @@
   // Returns true if this equals the |other| manifest.
   bool Equals(const Manifest* other) const;
 
   // Gets the underlying DictionaryValue representing the manifest.
   // Note: only know this when you KNOW you don't need the validation.
   base::DictionaryValue* value() const { return value_.get(); }
 
  private:
   // Returns true if the extension can specify the given |path|.
   bool CanAccessPath(const std::string& path) const;
-  bool CanAccessKey(const std::string& key, bool* was_known) const;
+  bool CanAccessKey(const std::string& key) const;
 
   // A persistent, globally unique ID. An extension's ID is used in things
   // like directory structures and URLs, and is expected to not change across
   // versions. It is generated as a SHA-256 hash of the extension's public
   // key, or as a hash of the path in the case of unpacked extensions.
   std::string extension_id_;
 
   // The location the extension was loaded from.
   Extension::Location location_;
 
   // The underlying dictionary representation of the manifest.
   scoped_ptr<base::DictionaryValue> value_;
 
   DISALLOW_COPY_AND_ASSIGN(Manifest);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_COMMON_EXTENSIONS_MANIFEST_H_