Split "Online" and "Offline" AudioContext processing

Source/modules/webaudio/DelayNode.h

Index: Source/modules/webaudio/DelayNode.h
diff --git a/Source/modules/webaudio/DelayNode.h b/Source/modules/webaudio/DelayNode.h
index f1465bac2f8c262d3c3d0a05553e63115ad31639..03d01889136b2ab82fad2c38bb9068f789b1beb9 100644
--- a/Source/modules/webaudio/DelayNode.h
+++ b/Source/modules/webaudio/DelayNode.h
@@ -29,17 +29,18 @@
 
 namespace blink {
 
+class AbstractAudioContext;
 class ExceptionState;
 
 class DelayNode final : public AudioNode {
     DEFINE_WRAPPERTYPEINFO();
 public:
-    static DelayNode* create(AudioContext&, float sampleRate, double maxDelayTime, ExceptionState&);
+    static DelayNode* create(AbstractAudioContext&, float sampleRate, double maxDelayTime, ExceptionState&);
     DECLARE_VIRTUAL_TRACE();
     AudioParam* delayTime();
 
 private:
-    DelayNode(AudioContext&, float sampleRate, double maxDelayTime);
+    DelayNode(AbstractAudioContext&, float sampleRate, double maxDelayTime);
 
     Member<AudioParam> m_delayTime;
 };