Enable pulse as the default IO handling in Chrome

media/base/media_switches.cc

Index: media/base/media_switches.cc
diff --git a/media/base/media_switches.cc b/media/base/media_switches.cc
index 266a9d2a55efe274872c611b185806b1edd1b513..c14bf977339a61555bf60db52c5786b8b8cc7a93 100644
--- a/media/base/media_switches.cc
+++ b/media/base/media_switches.cc
@@ -21,11 +21,6 @@ const char kAlsaInputDevice[] = "alsa-input-device";
 const char kUseCras[] = "use-cras";
 #endif
 
-#if defined(USE_PULSEAUDIO)
-// Use PulseAudio on platforms that support it.
-const char kUsePulseAudio[] = "use-pulseaudio";
-#endif
-
 #if defined(OS_WIN)
 // Use exclusive mode audio streaming for Windows Vista and higher.
 // Leads to lower latencies for audio streams which uses the