Move extensions BCKS factory creation

extensions/browser/browser_context_keyed_service_factories.h

Index: extensions/browser/browser_context_keyed_service_factories.h
diff --git a/extensions/browser/browser_context_keyed_service_factories.h b/extensions/browser/browser_context_keyed_service_factories.h
new file mode 100644
index 0000000000000000000000000000000000000000..9801a7ca6d3f450baea59e202286601c5333b055
--- /dev/null
+++ b/extensions/browser/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 EXTENSIONS_BROWSER_BROWSER_CONTEXT_KEYED_SERVICE_FACTORIES_
+#define EXTENSIONS_BROWSER_BROWSER_CONTEXT_KEYED_SERVICE_FACTORIES_
+
+namespace extensions {
+
+// Ensures the existence of any BrowserContextKeyedServiceFactory provided by
+// the core extensions code.
+void EnsureBrowserContextKeyedServiceFactoriesBuilt();
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_BROWSER_CONTEXT_KEYED_SERVICE_FACTORIES_