Remove som GYP annotations, remove unused manifest.

remoting/host/it2me/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("//build/config/features.gni")
 import("//remoting/remoting_enable.gni")
 import("//remoting/remoting_locales.gni")
 import("//remoting/remoting_version.gni")
 
 if (is_win) {
@@ skipping 50 matching lines @@
     if (use_gtk3) {
       deps += [ "//build/config/linux/gtk3" ]
     } else {
       deps += [ "//build/config/linux/gtk2" ]
     }
   }
 }
 
 if (!is_chromeos && enable_remoting_host) {
   if (is_win) {
-    # GYP version:
-    # //remoting/remoting_host_win.gypi:remoting_it2me_native_messaging_host
     executable("remote_assistance_host") {
       configs += [ "//build/config/compiler:wexit_time_destructors" ]
 
       deps = [
         "//base/allocator",
         "//remoting/host/win:dpi_aware_exe_manifest",
         "//remoting/host/win:remoting_core",
         "//remoting/host/win:remoting_windows_resources",
       ]
 
       sources = [
         "$root_gen_dir/remoting/version.rc",
         "it2me_native_messaging_host_entry_point.cc",
       ]
 
       defines = host_predefines + [ "BINARY=BINARY_REMOTE_ASSISTANCE_HOST" ]
 
       ldflags = [
         # "/NODEFAULTLIB", TODO(zijiehe): Why IgnoreAllDefaultLibraries: true in
         # GYP does not take effect?
         "comctl32.lib",
       ]
     }
 
-    # GYP version:
-    # //remoting/remoting_host_win.gypi:remoting_it2me_native_messaging_host_uiaccess
     executable("remote_assistance_host_uiaccess") {
       configs += [ "//build/config/compiler:wexit_time_destructors" ]
 
       deps = [
         "//base/allocator",
         "//remoting/host/win:remoting_core",
         "//remoting/host/win:remoting_windows_resources",
       ]
 
       sources = [
@@ skipping 130 matching lines @@
       if (is_desktop_linux) {
         if (use_gtk3) {
           deps += [ "//build/config/linux/gtk3" ]
         } else {
           deps += [ "//build/config/linux/gtk2" ]
         }
       }
     }
   }
 }