Update MidiDispatcher to use Mojo Permission Service.

content/public/browser/child_process_security_policy.h

Index: content/public/browser/child_process_security_policy.h
diff --git a/content/public/browser/child_process_security_policy.h b/content/public/browser/child_process_security_policy.h
index 7048d91cf529a13c23a6ffefd2dab445de4f9263..b2a343f05b142ecd67c37bf9627f989428c05319 100644
--- a/content/public/browser/child_process_security_policy.h
+++ b/content/public/browser/child_process_security_policy.h
@@ -150,6 +150,9 @@ class ChildProcessSecurityPolicy {
   // The browser should check this property before assuming the child process
   // is allowed to use WebUI bindings.
   virtual bool HasWebUIBindings(int child_id) = 0;
+
+  // Grants permission to send system exclusive message to any MIDI devices.
+  virtual void GrantSendMidiSysExMessage(int child_id) = 0;

[Tom Sepez, 2014/11/24 18:10:02]

I'd expected to see a corresponding CanSendMidi...() method?

[mlamouri (slow - plz ping), 2014/11/24 18:20:17]

It's in the _impl.h It seems that ChildProcessSecurityPolicy only has methods
that need to be public and the *Impl has the methods that can stay inside
content/.

I would gladly move CanSendMidiSysExMessage to the public interface if you
prefer.

[Tom Sepez, 2014/11/24 18:27:09]

Ah, OK.  Its OK where it is, I was just surprised not to see it change too.

 };
 
 }  // namespace content