Move chrome.downloads out of experimental to dev

chrome/browser/extensions/extension_system.cc

Index: chrome/browser/extensions/extension_system.cc
diff --git a/chrome/browser/extensions/extension_system.cc b/chrome/browser/extensions/extension_system.cc
index 1cc0ccc4c7f4aa1bb6d0072009f1b900d2b4cd79..fed833306b2e4a1695c2361d0a15753881573eb4 100644
--- a/chrome/browser/extensions/extension_system.cc
+++ b/chrome/browser/extensions/extension_system.cc
@@ -12,6 +12,7 @@
 #include "chrome/browser/extensions/component_loader.h"
 #include "chrome/browser/content_settings/cookie_settings.h"
 #include "chrome/browser/extensions/api/alarms/alarm_manager.h"
+#include "chrome/browser/extensions/api/downloads/downloads_api.h"
 #include "chrome/browser/extensions/api/declarative/rules_registry_service.h"
 #include "chrome/browser/extensions/extension_devtools_manager.h"
 #include "chrome/browser/extensions/extension_error_reporter.h"
@@ -253,6 +254,7 @@ void ExtensionSystemImpl::Init(bool extensions_enabled) {
 
   extension_process_manager_.reset(ExtensionProcessManager::Create(profile_));
   alarm_manager_.reset(new extensions::AlarmManager(profile_));
+  downloads_event_router_.reset(new ExtensionDownloadsEventRouter(profile_));
 
   shared_->Init(extensions_enabled);
 }