Allow app_shell to run past extension manifest parsing

extensions/common/manifest_handler.h

 // Copyright (c) 2013 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 EXTENSIONS_COMMON_MANIFEST_HANDLER_H_
 #define EXTENSIONS_COMMON_MANIFEST_HANDLER_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 44 matching lines @@
 
   // The list of keys that, if present, should be parsed before calling our
   // Parse (typically, because our Parse needs to read those keys).
   // Defaults to empty.
   virtual const std::vector<std::string> PrerequisiteKeys() const;
 
   // Associate us with our keys() in the manifest. A handler can register
   // for multiple keys. The global registry takes ownership of this;
   // if it has an existing handler for |key|, it replaces it with this.
   // Manifest handlers must be registered at process startup in
-  // chrome_manifest_handlers.cc:
+  // common_manifest_handlers.cc or chrome_manifest_handlers.cc:
   // (new MyManifestHandler)->Register();
   void Register();
 
   // Creates a |ManifestPermission| instance for the given manifest key |name|.
   // The returned permission does not contain any permission data, so this
   // method is usually used before calling |FromValue| or |Read|. Returns
   // |NULL| if the manifest handler does not support custom permissions.
   virtual ManifestPermission* CreatePermission();
 
   // Creates a |ManifestPermission| instance containing the initial set of
@@ skipping 88 matching lines @@
   // The priority for each manifest handler. Handlers with lower priority
   // values are evaluated first.
   ManifestHandlerPriorityMap priority_map_;
 
   bool is_finalized_;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_MANIFEST_HANDLER_H_