Remove som GYP annotations, remove unused manifest.

remoting/webapp/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.
 
 # Keep in sync with targets in remoting/remoting_client.gypi.
 
 import("//build/config/features.gni")
 import("//remoting/webapp/build_template.gni")
 import("//remoting/webapp/files.gni")
 
-# GYP version: remoting/remoting_client:remoting_credits
 action("credits") {
   about_credits_file = "$target_gen_dir/credits.html"
   script = "//tools/licenses.py"
 
   inputs = [
     "base/html/credits.tmpl",
     "base/html/credits_entry.tmpl",
   ]
 
   outputs = [
     about_credits_file,
   ]
 
   args = [
     "credits",
     rebase_path(about_credits_file, root_build_dir),
     "--file-template",
     rebase_path("base/html/credits.tmpl", root_build_dir),
     "--entry-template",
     rebase_path("base/html/credits_entry.tmpl", root_build_dir),
   ]
 }
 
 desktop_remoting_webapp("webapp") {
   output_dir = "$root_build_dir/remoting/remoting-webapp.v2"
   zip_path = "$root_build_dir/remoting-webapp.v2.zip"
   extra_files = [ "crd/remoting_client_pnacl.nmf.jinja2" ]
 }
 
-# GYP version: remoting/remoting_tests.gypi:remoting_browser_test_resources
 copy("browser_test_resources") {
   sources = remoting_webapp_browsertest_main_html_extra_files
   outputs = [
     "$root_out_dir/remoting/browser_test_resources/{{source_file_part}}",
   ]
 }
 
 remoting_unit_test_out_dir = "$root_out_dir/remoting/unittests"
 
 group("unit_tests") {
   data_deps = [
     ":blanketjs",
     ":unittest_html",
     ":js_files",
     ":qunit",
     ":sinonjs",
   ]
 }
 
 copy("js_files") {
-  # This list corresponds to webapp_js_files in remoting_webapp_unittests
-  # target in GYP.
   sources = webapp_js_files + remoting_webapp_unittests_all_files
   outputs = [
     "$remoting_unit_test_out_dir/{{source_file_part}}",
   ]
 }
 
 copy("blanketjs") {
   sources = [
     "//third_party/blanketjs/src/blanket.js",
     "//third_party/blanketjs/src/qunit_adapter.js",
@@ skipping 25 matching lines @@
 }
 
 build_webapp_html("unittest_html") {
   html_template_file = remoting_webapp_unittests_template_main
   html_template_include_files = []
   js_files = remoting_webapp_unittests_all_js_files
   html_output = "$remoting_unit_test_out_dir/unittests.html"
   exclude_js = remoting_webapp_unittests_exclude_js_files
   instrument_js = webapp_js_files
 }