message: Compile ADM pulse code by default.
  Pulse related code should still be disabled unless
  WEBRTC_ENABLE_LINUX_PULSE is defined but it will always be
  compiled.
  Cr-Commit-Position: refs/heads/master@{#30886}
diff: @@ -277,6 +277,8 @@ rtc_library("audio_device_impl") {
  defines += [ "WEBRTC_USE_X11" ]
  }
  if (rtc_include_pulse_audio) {
  + defines += [ "WEBRTC_ENABLE_LINUX_PULSE" ]
  + }
  sources += [
  "linux/audio_device_pulse_linux.cc",
  "linux/audio_device_pulse_linux.h",
  @@ -285,8 +287,6 @@ rtc_library("audio_device_impl") {
  "linux/pulseaudiosymboltable_linux.cc",
  "linux/pulseaudiosymboltable_linux.h",
  ]
  - defines += [ "WEBRTC_ENABLE_LINUX_PULSE" ]
  - }
  }
  if (is_mac) {
  sources += [
  