Remove GYP annotations from chrome, ui, tools GN files.

tools/android/forwarder2/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/symlink.gni")
 
-# GYP: //tools/android/forwarder2/forwarder.gyp:forwarder2
 group("forwarder2") {
   data_deps = [
     ":host_forwarder",
     ":device_forwarder_prepare_dist($default_toolchain)",
   ]
 }
 
 if (current_toolchain == default_toolchain) {
   import("//build/config/android/rules.gni")
 
-  # GYP: //tools/android/forwarder2/forwarder.gyp:device_forwarder
   executable("device_forwarder") {
     sources = [
       "command.cc",
       "command.h",
       "common.cc",
       "common.h",
       "daemon.cc",
       "daemon.h",
       "device_controller.cc",
       "device_controller.h",
@@ skipping 14 matching lines @@
     deps = [
       "//base",
       "//build/config/sanitizers:deps",
       "//tools/android/common",
     ]
     data_deps = [
       "//build/android/pylib/device/commands",
     ]
   }
 
-  # GYP: //tools/android/forwarder2/forwarder.gyp:forwarder2
   create_native_executable_dist("device_forwarder_prepare_dist") {
     dist_dir = "$root_build_dir/forwarder_dist"
     binary = "$root_build_dir/device_forwarder"
     deps = [
       ":device_forwarder",
     ]
   }
 }
 
 if (current_toolchain != default_toolchain) {
-  # GYP: //tools/android/forwarder2/forwarder.gyp:host_forwarder
   executable("host_forwarder") {
     sources = [
       "command.cc",
       "command.h",
       "common.cc",
       "common.h",
       "daemon.cc",
       "daemon.h",
       "forwarder.cc",
       "forwarder.h",
@@ skipping 14 matching lines @@
       "//build/config/sanitizers:deps",
       "//tools/android/common",
     ]
   }
 } else {
   # Create a symlink from root_build_dir -> clang_x64/host_forwarder.
   binary_symlink("host_forwarder") {
     binary_label = ":$target_name($host_toolchain)"
   }
 }