Apply OwnPtr|PassOwnPtr to handle member variables and arguments in MIDIClient

Source/web/MIDIClientProxy.h

Index: Source/web/MIDIClientProxy.h
diff --git a/Source/web/MIDIClientProxy.h b/Source/web/MIDIClientProxy.h
index 35a6f4cd924474630cccd9afb2d48061600a5794..764e8681cdfde03a7e95d1288642adc1313a15d6 100644
--- a/Source/web/MIDIClientProxy.h
+++ b/Source/web/MIDIClientProxy.h
@@ -44,13 +44,15 @@ class WebMIDIClient;
 
 class MIDIClientProxy FINAL : public WebCore::MIDIClient {
 public:
-    explicit MIDIClientProxy(WebMIDIClient*);
+    static PassOwnPtr<MIDIClientProxy> create(WebMIDIClient*);
 
     // WebCore::MIDIClient
     virtual void requestSysexPermission(PassRefPtrWillBeRawPtr<WebCore::MIDIAccess>) OVERRIDE;
     virtual void cancelSysexPermissionRequest(WebCore::MIDIAccess*) OVERRIDE;
 
 private:
+    explicit MIDIClientProxy(WebMIDIClient*);
+
     WebMIDIClient* m_client;
 };