Remove GYP annotations from third_party GN files.

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/*" ]
 
-# bindings_modules_generated in modules/v8/generated.gyp
 group("bindings_modules_generated") {
   public_deps = [
     ":bindings_modules_impl_generated",
     ":bindings_modules_v8_generated_init_partial",
     ":generate_bindings_modules_v8_interfaces",
     ":generate_bindings_modules_v8_partial_interfaces",
   ]
 }
 
 idl_compiler("generate_bindings_modules_v8_interfaces") {
-  # Note in GYP this is modules_interface_idl_files but this variable is just
-  # defined to modules_definition_idl_files.
   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
   output_dir = bindings_modules_v8_output_dir
   target_component = "modules"
 }
 
 idl_compiler("generate_bindings_modules_v8_partial_interfaces") {
-  # Note in GYP this is modules_interface_idl_files but this variable is just
-  # defined to modules_definition_idl_files.
   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"
 }
 
-# GYP version: Source/bindings/modules/v8/generated.gyp:bindings_modules_v8_generated_init_partial
 action("bindings_modules_v8_generated_init_partial") {
   script = "$bindings_scripts_dir/generate_init_partial_interfaces.py"
 
   inputs = [
     "$bindings_modules_output_dir/InterfacesInfoOverall.pickle",
   ]
   outputs = [
     bindings_modules_generated_init_partial_interfaces_file,
   ]
 
   # Put the IDL file list in a response file to avoid command-line limits.
   response_file_contents =
       rebase_path(core_idl_with_modules_dependency_files, root_build_dir)
 
   args = [
     "--idl-files-list",
     "{{response_file_name}}",
     "--output",
     rebase_path(bindings_modules_generated_init_partial_interfaces_file,
                 root_build_dir),
     "--write-file-only-if-changed=1",
   ]
 
   deps = [
     "//third_party/WebKit/Source/bindings/modules:interfaces_info",
   ]
 }