Move PrefMember and PrefChangeRegistrar to api directory.

chrome/browser/extensions/api/font_settings/font_settings_api.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.
 
 // Defines the classes to realize the Font Settings Extension API as specified
 // in the extension API JSON.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_FONT_SETTINGS_FONT_SETTINGS_API_H__
 #define CHROME_BROWSER_EXTENSIONS_API_FONT_SETTINGS_FONT_SETTINGS_API_H__
 
 #include <map>
 #include <string>
 #include <utility>
 
+#include "chrome/browser/api/prefs/pref_change_registrar.h"
 #include "chrome/browser/extensions/extension_function.h"
-#include "chrome/browser/prefs/pref_change_registrar.h"
 
 namespace extensions {
 
 // This class observes pref changed events on a profile and dispatches the
 // corresponding extension API events to extensions.
 class FontSettingsEventRouter : public content::NotificationObserver {
  public:
   // Constructor for observing pref changed events on |profile|. Stores a
   // pointer to |profile| but does not take ownership. |profile| must be
   // non-NULL and remain alive for the lifetime of the instance. Init() must be
@@ skipping 266 matching lines @@
   virtual ~SetMinimumFontSizeFunction() {}
 
   // SetFontPrefExtensionFunction:
   virtual const char* GetPrefName() OVERRIDE;
   virtual const char* GetKey() OVERRIDE;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_FONT_SETTINGS_FONT_SETTINGS_API_H__