make pulseaudio available for all posix platforms because it's not linux only

media/audio/pulse/pulse_output.cc

Index: media/audio/pulse/pulse_output.cc
diff --git a/media/audio/linux/pulse_output.cc b/media/audio/pulse/pulse_output.cc
similarity index 98%
rename from media/audio/linux/pulse_output.cc
rename to media/audio/pulse/pulse_output.cc
index ddd23ca7a8cc3818d43f4776fe23f459011f3a42..27268cef16de1c7f7335b2376a70d404e59e632e 100644
--- a/media/audio/linux/pulse_output.cc
+++ b/media/audio/pulse/pulse_output.cc
@@ -2,13 +2,17 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "media/audio/linux/pulse_output.h"
+#include "media/audio/pulse/pulse_output.h"
 
 #include "base/bind.h"
 #include "base/message_loop.h"
 #include "media/audio/audio_parameters.h"
 #include "media/audio/audio_util.h"
+#if defined(OS_LINUX)
 #include "media/audio/linux/audio_manager_linux.h"
+#elif defined(OS_OPENBSD)
+#include "media/audio/openbsd/audio_manager_openbsd.h"
+#endif
 #include "media/base/data_buffer.h"
 #include "media/base/seekable_buffer.h"
 
@@ -128,7 +132,11 @@ void PulseAudioOutputStream::WriteRequestCallback(
 }
 
 PulseAudioOutputStream::PulseAudioOutputStream(const AudioParameters& params,
+#if defined(OS_LINUX)
                                                AudioManagerLinux* manager,
+#elif defined(OS_OPENBSD)
+                                               AudioManagerOpenBSD* manager,
+#endif
                                                MessageLoop* message_loop)
     : channel_layout_(params.channel_layout),
       channel_count_(ChannelLayoutToChannelCount(channel_layout_)),