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

Source/web/MIDIClientProxy.cpp

Index: Source/web/MIDIClientProxy.cpp
diff --git a/Source/web/MIDIClientProxy.cpp b/Source/web/MIDIClientProxy.cpp
index a85f91e8e15f8c661a7099443b850d3075e0c5b0..abcdf7e03bb2a343a73a64b7f3f8973fdc8aef7e 100644
--- a/Source/web/MIDIClientProxy.cpp
+++ b/Source/web/MIDIClientProxy.cpp
@@ -44,6 +44,11 @@ MIDIClientProxy::MIDIClientProxy(WebMIDIClient* client)
 {
 }
 
+PassOwnPtr<MIDIClientProxy> MIDIClientProxy::create(WebMIDIClient* client)
+{
+    return adoptPtr(new MIDIClientProxy(client));

[jochen (gone - plz use gerrit), 2014/04/02 09:28:59]

nit should go into the header

+}
+
 void MIDIClientProxy::requestSysexPermission(PassRefPtrWillBeRawPtr<MIDIAccess> access)
 {
     if (m_client)

[haraken, 2014/04/02 01:08:54]

Is it possible that m_client is 0?

[gyuyoung-inactive, 2014/04/02 01:17:35]

Yes, client parameter of WebViewImpl's ctor can be 0. So, if the client is null,
WebViewImpl has passed 0 to MIDIClientProxy. That's why MIDIClientProxy's
m_client can be 0.

- m_midiClientProxy(adoptPtr(new MIDIClientProxy(client ?
client->webMIDIClient() : 0)))
+ provideMIDITo(*m_page, MIDIClientProxy::create(client ?
client->webMIDIClient() : 0));