[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/api_binding_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 "extensions/renderer/api_binding_hooks_delegate.h"
-
-namespace extensions {
-
-APIBindingHooksDelegate::~APIBindingHooksDelegate() {}
-
-bool APIBindingHooksDelegate::CreateCustomEvent(
-    v8::Local<v8::Context> context,
-    const binding::RunJSFunctionSync& run_js_sync,
-    const std::string& event_name,
-    v8::Local<v8::Value>* event_out) {
-  return false;
-}
-
-APIBindingHooks::RequestResult APIBindingHooksDelegate::HandleRequest(
-    const std::string& method_name,
-    const APISignature* signature,
-    v8::Local<v8::Context> context,
-    std::vector<v8::Local<v8::Value>>* arguments,
-    const APITypeReferenceMap& refs) {
-  return APIBindingHooks::RequestResult(
-      APIBindingHooks::RequestResult::NOT_HANDLED);
-}
-
-}  // namespace extensions