Replace hand-written IDBObserverCallback with auto-generated code

third_party/WebKit/Source/bindings/modules/v8/BUILD.gn

 # 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.
 
 import("//third_party/WebKit/Source/bindings/modules/v8/generated.gni")
 import("//third_party/WebKit/Source/bindings/scripts/scripts.gni")
 import("//third_party/WebKit/Source/modules/modules.gni")
 import("//third_party/WebKit/Source/modules/modules_idl_files.gni")
 
 visibility = [ "//third_party/WebKit/*" ]
@@ skipping 10 matching lines @@
 idl_compiler("generate_bindings_modules_v8_interfaces") {
   sources = modules_definition_idl_files
   output_dir = bindings_modules_v8_output_dir
   output_name_suffix = ""
   target_component = "modules"
 }
 
 idl_impl("bindings_modules_impl_generated") {
   sources = modules_dictionary_idl_files
   outputs = bindings_modules_generated_union_type_files +
-            generated_modules_dictionary_files
+            generated_modules_dictionary_files +
+            generated_modules_callback_function_files
   output_dir = bindings_modules_v8_output_dir
   target_component = "modules"
 }
 
 idl_compiler("generate_bindings_modules_v8_partial_interfaces") {
   sources = core_idl_with_modules_dependency_files +
             webcore_testing_idl_with_modules_dependency_files
   output_dir = bindings_modules_v8_output_dir
   output_name_suffix = "Partial"
   target_component = "modules"
@@ skipping 18 matching lines @@
     "{{response_file_name}}",
     "--output",
     rebase_path(bindings_modules_generated_init_partial_interfaces_file,
                 root_build_dir),
   ]
 
   deps = [
     "//third_party/WebKit/Source/bindings/modules:interfaces_info",
   ]
 }