[Extensions Bindings] Move custom handling to APIBindingHooksDelegate

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