[Extensions Bindings] Add a bindings/ subdirectory under renderer

chrome/renderer/extensions/app_hooks_delegate.cc

 // Copyright 2017 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.
 
 #include "chrome/renderer/extensions/app_hooks_delegate.h"
 
-#include "extensions/renderer/api_request_handler.h"
-#include "extensions/renderer/api_signature.h"
+#include "extensions/renderer/bindings/api_request_handler.h"
+#include "extensions/renderer/bindings/api_signature.h"
 #include "extensions/renderer/script_context_set.h"
 #include "gin/converter.h"
 
 namespace extensions {
 
 namespace {
 
 void IsInstalledGetterCallback(
     v8::Local<v8::String> property,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
@@ skipping 83 matching lines @@
                                          const std::string& install_state) {
   // Note: it's kind of lame that we serialize the install state to a
   // base::Value here when we're just going to later convert it to v8, but it's
   // not worth the specialization on APIRequestHandler for this oddball API.
   base::ListValue response;
   response.AppendString(install_state);
   request_handler_->CompleteRequest(request_id, response, std::string());
 }
 
 }  // namespace extensions