Extension Settings API: move the API functions into an object SettingsNamepace,

chrome/browser/extensions/settings/settings_leveldb_storage.h

 // Copyright (c) 2011 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_SETTINGS_SETTINGS_LEVELDB_STORAGE_H_
 #define CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_LEVELDB_STORAGE_H_
 #pragma once
 
 #include <string>
 
@@ skipping 11 matching lines @@
 // Extension settings storage object, backed by a leveldb database.
 //
 // No caching is done; that should be handled by wrapping with an
 // SettingsStorageCache.
 // All methods must be run on the FILE thread.
 class SettingsLeveldbStorage : public SettingsStorage {
  public:
   // Factory for creating SettingsLeveldbStorage instances.
   class Factory : public SettingsStorageFactory {
    public:
-    Factory() {}
-    virtual ~Factory() {}
-
-    // SettingsStorageFactory implementation.
     virtual SettingsStorage* Create(
-        const FilePath& base_path, const std::string& extension_id) OVERRIDE;
+        const FilePath& base_path,
+        const std::string& extension_id) OVERRIDE;
 
    private:
-    DISALLOW_COPY_AND_ASSIGN(Factory);
+    // SettingsStorageFactory is refcounted.
+    virtual ~Factory() {}
   };
 
   // Must be deleted on the FILE thread.
   virtual ~SettingsLeveldbStorage();
 
   // SettingsStorage implementation.
   virtual ReadResult Get(const std::string& key) OVERRIDE;
   virtual ReadResult Get(const std::vector<std::string>& keys) OVERRIDE;
   virtual ReadResult Get() OVERRIDE;
   virtual WriteResult Set(
@@ skipping 28 matching lines @@
 
   // leveldb backend.
   scoped_ptr<leveldb::DB> db_;
 
   DISALLOW_COPY_AND_ASSIGN(SettingsLeveldbStorage);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_LEVELDB_STORAGE_H_