Split ExtensionSystem interface from ExtensionSystemImpl implementation, part 1.

chrome/browser/sync/glue/extension_setting_data_type_controller.cc

Index: chrome/browser/sync/glue/extension_setting_data_type_controller.cc
diff --git a/chrome/browser/sync/glue/extension_setting_data_type_controller.cc b/chrome/browser/sync/glue/extension_setting_data_type_controller.cc
index 90a11975835861371ba277b8bed5b4a9f20dc4cb..8d968cc2f1725649a80c6761ef87bc908deac622 100644
--- a/chrome/browser/sync/glue/extension_setting_data_type_controller.cc
+++ b/chrome/browser/sync/glue/extension_setting_data_type_controller.cc
@@ -7,11 +7,11 @@
 #include "base/bind.h"
 #include "base/metrics/histogram.h"
 #include "chrome/browser/extensions/extension_service.h"
-#include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sync/glue/generic_change_processor.h"
 #include "chrome/browser/sync/profile_sync_components_factory.h"
 #include "content/public/browser/browser_thread.h"
+#include "extensions/browser/extension_system.h"
 #include "sync/api/syncable_service.h"
 
 using content::BrowserThread;