Move permission warning message handling from PermissionSet to PermissionMessageProvider.

extensions/common/extensions_client.h

 // Copyright 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_EXTENSIONS_CLIENT_H_
 #define EXTENSIONS_COMMON_EXTENSIONS_CLIENT_H_
 
 #include <set>
 #include <string>
 
 namespace extensions {
 
 class FeatureProvider;
 class PermissionMessage;
+class PermissionMessageProvider;
 class PermissionsProvider;
 class URLPatternSet;
 
 // Sets up global state for the extensions system. Should be Set() once in each
 // process. This should be implemented by the client of the extensions system.
 class ExtensionsClient {
  public:
+  // Initializes global state. Not done in the constructor because unit tests
+  // can create additional ExtensionsClients because the utility thread runs
+  // in-process.
+  virtual void Initialize() = 0;
+
   // Returns a PermissionsProvider to initialize the permissions system.
   virtual const PermissionsProvider& GetPermissionsProvider() const = 0;
 
+  // Returns the global PermissionMessageProvider to use to provide permission
+  // warning strings.
+  virtual const PermissionMessageProvider& GetPermissionMessageProvider()
+      const = 0;
+
   // Gets a feature provider for a specific feature type.
   virtual FeatureProvider* GetFeatureProviderByName(const std::string& name)
       const = 0;
 
-  // Called at startup. Registers the handlers for parsing manifests.
-  virtual void RegisterManifestHandlers() const = 0;
-
   // Takes the list of all hosts and filters out those with special
   // permission strings. Adds the regular hosts to |new_hosts|,
   // and adds the special permission messages to |messages|.
   virtual void FilterHostPermissions(
       const URLPatternSet& hosts,
       URLPatternSet* new_hosts,
       std::set<PermissionMessage>* messages) const = 0;
 
   // Return the extensions client.
   static ExtensionsClient* Get();
 
   // Initialize the extensions system with this extensions client.
   static void Set(ExtensionsClient* client);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_EXTENSIONS_CLIENT_H_