Fix pkg-config issue with cras for Chrome OS build.

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("//build/config/linux/pkg_config.gni")
 import("//media/media_options.gni")
 
 # When libpulse is not directly linked, use stubs to allow for dlopening of the
 # binary.
 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" ]
@@ skipping 185 matching lines @@
       "cras/audio_manager_cras.h",
       "cras/cras_input.cc",
       "cras/cras_input.h",
       "cras/cras_unified.cc",
       "cras/cras_unified.h",
     ]
 
     pkg_config("libcras") {
       packages = [ "libcras" ]
     }
-    configs += [ "libcras" ]
+    configs += [ ":libcras" ]
   }
 
   if (use_pulseaudio) {
     sources += [
       "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",
@@ skipping 99 matching lines @@
       "win/core_audio_util_win_unittest.cc",
     ]
   }
 
   if (use_alsa) {
     sources += [
       "alsa/alsa_output_unittest.cc",
     ]
   }
 }