Split "Online" and "Offline" AudioContext processing

Source/modules/webaudio/WaveShaperNode.h

Index: Source/modules/webaudio/WaveShaperNode.h
diff --git a/Source/modules/webaudio/WaveShaperNode.h b/Source/modules/webaudio/WaveShaperNode.h
index e87da39a6ce40abab1fd72946e364d660ec90f49..fb05ea34eb6a41637dfc63d5ace8f684f9e01143 100644
--- a/Source/modules/webaudio/WaveShaperNode.h
+++ b/Source/modules/webaudio/WaveShaperNode.h
@@ -31,12 +31,13 @@
 
 namespace blink {
 
+class AbstractAudioContext;
 class ExceptionState;
 
 class WaveShaperNode final : public AudioNode {
     DEFINE_WRAPPERTYPEINFO();
 public:
-    static WaveShaperNode* create(AudioContext& context)
+    static WaveShaperNode* create(AbstractAudioContext& context)
     {
         return new WaveShaperNode(context);
     }
@@ -49,7 +50,7 @@ public:
     String oversample() const;
 
 private:
-    explicit WaveShaperNode(AudioContext&);
+    explicit WaveShaperNode(AbstractAudioContext&);
 
     WaveShaperProcessor* waveShaperProcessor() const;
 };