GN: Change gen command syntax, support relative dirs.

base/BUILD.gn

 # Copyright (c) 2013 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/ui.gni")
 
 component("base") {
   external = true
   sources = [
     "../build/build_config.h",
@@ skipping 653 matching lines @@
     "win/scoped_process_information.cc",
     "win/scoped_process_information.h",
     "win/scoped_propvariant.h",
     "win/scoped_select_object.h",
     "win/scoped_variant.cc",
     "win/scoped_variant.h",
     "win/shortcut.cc",
     "win/shortcut.h",
     "win/startup_information.cc",
     "win/startup_information.h",
-    "win/text_services_message_filter.cc",
-    "win/text_services_message_filter.h",
     "win/win_util.cc",
     "win/win_util.h",
     "win/windows_version.cc",
     "win/windows_version.h",
     "win/wrapped_window_proc.cc",
     "win/wrapped_window_proc.h",
   ]
 
   # TODO(brettw) I don't understand the conditions this file is used.
   sources -= [ "files/file_path_watcher_stub.cc" ]
@@ skipping 213 matching lines @@
   #    # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
   #    'msvs_disabled_warnings': [
   #      4267,
   #    ],
   #  }],
   #],
   #'variables': {
   #  'optimize': 'max',
   #},
 }