[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/bindings/api_bindings_system.cc

Index: extensions/renderer/bindings/api_bindings_system.cc
diff --git a/extensions/renderer/api_bindings_system.cc b/extensions/renderer/bindings/api_bindings_system.cc
similarity index 98%
rename from extensions/renderer/api_bindings_system.cc
rename to extensions/renderer/bindings/api_bindings_system.cc
index c39be87b7ca6ab000ccf31a335e366b1fe61f166..f3b0790dfd12326153a97e2d4f981d8d60bfc342 100644
--- a/extensions/renderer/api_bindings_system.cc
+++ b/extensions/renderer/bindings/api_bindings_system.cc
@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "extensions/renderer/api_bindings_system.h"
+#include "extensions/renderer/bindings/api_bindings_system.h"
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "base/values.h"
-#include "extensions/renderer/api_binding_hooks.h"
+#include "extensions/renderer/bindings/api_binding_hooks.h"
 
 namespace extensions {