Decouple MIDIAccess initialization from MIDIAccess class.

Source/modules/webmidi/MIDIClient.h

Index: Source/modules/webmidi/MIDIClient.h
diff --git a/Source/modules/webmidi/MIDIClient.h b/Source/modules/webmidi/MIDIClient.h
index e07acd4da4e6e6b5e04724df190acdecacb2bbc8..ee0912149403ba4fa5523a5d02f3cd7f0143fceb 100644
--- a/Source/modules/webmidi/MIDIClient.h
+++ b/Source/modules/webmidi/MIDIClient.h
@@ -35,13 +35,13 @@
 
 namespace WebCore {
 
-class MIDIAccess;
+class MIDIAccessInitializer;
 class Page;
 
 class MIDIClient {
 public:
-    virtual void requestSysexPermission(PassRefPtrWillBeRawPtr<MIDIAccess>) = 0;

[Takashi Toyoshima, 2014/06/04 22:03:53]

Note: I just didn't understand why we can change it from PassRefPtrWillBeRwPtr<>
to raw pointer.

[yhirano, 2014/06/05 11:35:25]

I would like MIDIInitializer to own all initialization-related resouces.
It means that the request will be canceled when MIDIAccessInitializer becomes
invalid and so I think it is OK to pass a raw pointer.

-    virtual void cancelSysexPermissionRequest(MIDIAccess*) = 0;
+    virtual void requestSysexPermission(MIDIAccessInitializer*) = 0;
+    virtual void cancelSysexPermissionRequest(MIDIAccessInitializer*) = 0;
 
     virtual ~MIDIClient() { }
 };