Web Audio: Rename AudioParam class to AudioParamHandler.

Source/modules/webaudio/AudioParam.h

Index: Source/modules/webaudio/AudioParam.h
diff --git a/Source/modules/webaudio/AudioParam.h b/Source/modules/webaudio/AudioParam.h
index 22a76d011f162255b4f89d9afc38a46d9f16f751..d278d57cde6853c9b44916a5fdb9f9d12f520c75 100644
--- a/Source/modules/webaudio/AudioParam.h
+++ b/Source/modules/webaudio/AudioParam.h
@@ -42,15 +42,15 @@ namespace blink {
 
 class AudioNodeOutput;
 
-class AudioParam final : public AudioSummingJunction, public ScriptWrappable {
+class AudioParamHandler final : public AudioSummingJunction, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static const double DefaultSmoothingConstant;
     static const double SnapThreshold;
 
-    static AudioParam* create(AudioContext* context, double defaultValue)
+    static AudioParamHandler* create(AudioContext* context, double defaultValue)
     {
-        return new AudioParam(context, defaultValue);
+        return new AudioParamHandler(context, defaultValue);
     }
 
     // AudioSummingJunction
@@ -115,7 +115,7 @@ public:
     void disconnect(AudioNodeOutput&);
 
 private:
-    AudioParam(AudioContext* context, double defaultValue)
+    AudioParamHandler(AudioContext* context, double defaultValue)
         : AudioSummingJunction(context)
         , m_value(defaultValue)
         , m_defaultValue(defaultValue)
@@ -134,6 +134,10 @@ private:
     AudioParamTimeline m_timeline;
 };
 
+// TODO(tkent): remove the type alias, and introduce a real AudioParam class to
+// wrap AudioParamHandler.
+using AudioParam = AudioParamHandler;
+
 } // namespace blink
 
 #endif // AudioParam_h