Move the serial API to extensions/.

chrome/browser/extensions/browser_context_keyed_service_factories.cc

Index: chrome/browser/extensions/browser_context_keyed_service_factories.cc
diff --git a/chrome/browser/extensions/browser_context_keyed_service_factories.cc b/chrome/browser/extensions/browser_context_keyed_service_factories.cc
index 900067e78b6e04a596ff2e6c16a1e834419e0a5c..e8dee929401af72e36b7e201a83ed489c99d4b68 100644
--- a/chrome/browser/extensions/browser_context_keyed_service_factories.cc
+++ b/chrome/browser/extensions/browser_context_keyed_service_factories.cc
@@ -40,7 +40,6 @@
 #include "chrome/browser/extensions/api/processes/processes_api.h"
 #include "chrome/browser/extensions/api/push_messaging/push_messaging_api.h"
 #include "chrome/browser/extensions/api/screenlock_private/screenlock_private_api.h"
-#include "chrome/browser/extensions/api/serial/serial_connection.h"
 #include "chrome/browser/extensions/api/sessions/sessions_api.h"
 #include "chrome/browser/extensions/api/settings_overrides/settings_overrides_api.h"
 #include "chrome/browser/extensions/api/signed_in_devices/signed_in_devices_manager.h"
@@ -86,8 +85,6 @@ void EnsureBrowserContextKeyedServiceFactoriesBuilt() {
   extensions::ActivityLogAPI::GetFactoryInstance();
   extensions::AlarmManager::GetFactoryInstance();
   extensions::ApiResourceManager<
-      extensions::SerialConnection>::GetFactoryInstance();
-  extensions::ApiResourceManager<
       extensions::UsbDeviceResource>::GetFactoryInstance();
   extensions::AudioAPI::GetFactoryInstance();
   extensions::BookmarksAPI::GetFactoryInstance();