[part 2] Make classes and structures in modules fast-allocated.

Source/modules/webaudio/AudioNodeInput.h

Index: Source/modules/webaudio/AudioNodeInput.h
diff --git a/Source/modules/webaudio/AudioNodeInput.h b/Source/modules/webaudio/AudioNodeInput.h
index bdf1a3f8f074d40f063c809addbd73cabd4af3f5..ed7e28cdc61f10c233ec6117a7bd5af7e48c8dda 100644
--- a/Source/modules/webaudio/AudioNodeInput.h
+++ b/Source/modules/webaudio/AudioNodeInput.h
@@ -28,6 +28,7 @@
 #include "modules/webaudio/AudioNode.h"
 #include "modules/webaudio/AudioSummingJunction.h"
 #include "platform/audio/AudioBus.h"
+#include "wtf/FastAllocBase.h"
 #include "wtf/HashSet.h"
 
 namespace blink {
@@ -39,6 +40,7 @@ class AudioNodeOutput;
 // The number of channels of the input's bus is the maximum of the number of channels of all its connections.
 
 class AudioNodeInput final : public AudioSummingJunction {
+    WTF_MAKE_FAST_ALLOCATED(AudioNodeInput);
 public:
     static PassOwnPtr<AudioNodeInput> create(AudioHandler&);