Convert various media options into proper declare_args().

media/audio/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("//media/media_options.gni")
 
 # When libpulse is not directly linked, use stubs to allow for dlopening of the
 # binary.
-if (!linux_link_pulseaudio) {
+if (!link_pulseaudio) {
   action("pulse_generate_stubs") {
     extra_header = "pulse/pulse_stub_header.fragment"
 
     script = "../../tools/generate_stubs/generate_stubs.py"
     sources = [ "pulse/pulse.sigs" ]
     source_prereqs = [ extra_header ]
     stubs_filename_root = "pulse_stubs"
 
     # TODO(ajwong): these need to be included in the pulse build.
     outputs = [
@@ skipping 194 matching lines @@
       "pulse/audio_manager_pulse.cc",
       "pulse/audio_manager_pulse.h",
       "pulse/pulse_input.cc",
       "pulse/pulse_input.h",
       "pulse/pulse_output.cc",
       "pulse/pulse_output.h",
       "pulse/pulse_util.cc",
       "pulse/pulse_util.h",
     ]
 
-    if (linux_link_pulseaudio) {
+    if (link_pulseaudio) {
       pkg_config("libpulse") {
         packages = [ "libpulse" ]
       }
       configs += [ ":libpulse" ]
     } else {
       # TODO(ajwong): Technically, this dl should go in the action.
       libs += [ "dl" ]
       deps += [ ":pulse_generate_stubs" ]
       sources += get_target_outputs(":pulse_generate_stubs")
     }
@@ skipping 84 matching lines @@
       "win/core_audio_util_win_unittest.cc",
     ]
   }
 
   if (use_alsa) {
     sources += [
       "alsa/alsa_output_unittest.cc",
     ]
   }
 }