Clean up forward declarations in Source/modules

Source/modules/webaudio/ScriptProcessorNode.h

Index: Source/modules/webaudio/ScriptProcessorNode.h
diff --git a/Source/modules/webaudio/ScriptProcessorNode.h b/Source/modules/webaudio/ScriptProcessorNode.h
index 18d728849717e3494e24b543b72b7cf803c772cb..809cd1042d149c082464f0a6a3863aa00bc57e8c 100644
--- a/Source/modules/webaudio/ScriptProcessorNode.h
+++ b/Source/modules/webaudio/ScriptProcessorNode.h
@@ -25,10 +25,7 @@
 #ifndef ScriptProcessorNode_h
 #define ScriptProcessorNode_h
 
-#include "platform/audio/AudioBus.h"
 #include "modules/webaudio/AudioNode.h"
-#include "wtf/Forward.h"
-#include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 
@@ -36,7 +33,6 @@ namespace blink {
 
 class AudioBuffer;
 class AudioContext;
-class AudioProcessingEvent;
 
 // ScriptProcessorNode is an AudioNode which allows for arbitrary synthesis or processing directly using JavaScript.
 // The API allows for a variable number of inputs and outputs, although it must have at least one input or output.