Split ExtensionSystem interface from ExtensionSystemImpl implementation, part 1.

chrome/browser/extensions/api/font_settings/font_settings_api.cc

 // 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.
 
 // Font Settings Extension API implementation.
 
 #include "chrome/browser/extensions/api/font_settings/font_settings_api.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/json/json_writer.h"
 #include "base/lazy_instance.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/values.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/api/preference/preference_api.h"
 #include "chrome/browser/extensions/api/preference/preference_helpers.h"
 #include "chrome/browser/extensions/extension_service.h"
-#include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/extensions/api/font_settings.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/pref_names_util.h"
 #include "content/public/browser/font_list_async.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_source.h"
+#include "extensions/browser/extension_system.h"
 #include "extensions/common/error_utils.h"
 
 #if defined(OS_WIN)
 #include "ui/gfx/font.h"
 #include "ui/gfx/platform_font_win.h"
 #endif
 
 namespace extensions {
 
 namespace fonts = api::font_settings;
@@ skipping 408 matching lines @@
 
 const char* FontSettingsSetMinimumFontSizeFunction::GetPrefName() {
   return prefs::kWebKitMinimumFontSize;
 }
 
 const char* FontSettingsSetMinimumFontSizeFunction::GetKey() {
   return kPixelSizeKey;
 }
 
 }  // namespace extensions