Remove USE(GSTREAMER) and USE(WEBAUDIO_GSTREAMER) guards.

Source/modules/webaudio/AudioContext.cpp

Index: Source/modules/webaudio/AudioContext.cpp
diff --git a/Source/modules/webaudio/AudioContext.cpp b/Source/modules/webaudio/AudioContext.cpp
index 04cdd4c691e9ad56bd7822607bbb9f05288edecb..9dc2df9b170720dfcd6202c9e9fbcbef79390018 100644
--- a/Source/modules/webaudio/AudioContext.cpp
+++ b/Source/modules/webaudio/AudioContext.cpp
@@ -76,10 +76,6 @@
 #include <stdio.h>
 #endif
 
-#if USE(GSTREAMER)
-#include "GStreamerUtilities.h"
-#endif
-
 #include <wtf/ArrayBuffer.h>
 #include <wtf/Atomics.h>
 #include <wtf/MainThread.h>
@@ -176,10 +172,6 @@ void AudioContext::constructCommon()
     // Lets mark it as ActiveDOMObject with pending activity and unmark it in clear method.
     setPendingActivity(this);
 
-#if USE(GSTREAMER)
-    initializeGStreamer();
-#endif
-
     FFTFrame::initialize();
     
     m_listener = AudioListener::create();