Move extensions BCKS factory creation

apps/browser_context_keyed_service_factories.h

Index: apps/browser_context_keyed_service_factories.h
diff --git a/apps/browser_context_keyed_service_factories.h b/apps/browser_context_keyed_service_factories.h
new file mode 100644
index 0000000000000000000000000000000000000000..efad2acee90250e1ee37252f9da634e762881ddc
--- /dev/null
+++ b/apps/browser_context_keyed_service_factories.h
@@ -0,0 +1,16 @@
+// Copyright 2014 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.
+
+#ifndef APPS_BROWSER_CONTEXT_KEYED_SERVICE_FACTORIES_
+#define APPS_BROWSER_CONTEXT_KEYED_SERVICE_FACTORIES_
+
+namespace apps {
+
+// Ensures the existence of any BrowserContextKeyedServiceFactory provided by
+// the core apps code.
+void EnsureBrowserContextKeyedServiceFactoriesBuilt();
+
+}  // namespace apps
+
+#endif  // APPS_BROWSER_CONTEXT_KEYED_SERVICE_FACTORIES_