Update MidiDispatcher to use Mojo Permission Service.

content/browser/child_process_security_policy_impl.h

Index: content/browser/child_process_security_policy_impl.h
diff --git a/content/browser/child_process_security_policy_impl.h b/content/browser/child_process_security_policy_impl.h
index dcc1b887fab2dcc5d6476bb0529aa2d4c07ec170..db673c1bdafae5b88f466c9495c98b243e55fa02 100644
--- a/content/browser/child_process_security_policy_impl.h
+++ b/content/browser/child_process_security_policy_impl.h
@@ -73,6 +73,7 @@ class CONTENT_EXPORT ChildProcessSecurityPolicyImpl
   bool CanDeleteFromFileSystem(int child_id,
                                const std::string& filesystem_id) override;
   bool HasWebUIBindings(int child_id) override;
+  void GrantSendMidiSysExMessage(int child_id) override;
 
   // Pseudo schemes are treated differently than other schemes because they
   // cannot be requested like normal URLs.  There is no mechanism for revoking
@@ -119,9 +120,6 @@ class CONTENT_EXPORT ChildProcessSecurityPolicyImpl
   // Revoke read raw cookies permission.
   void RevokeReadRawCookies(int child_id);
 
-  // Grants permission to send system exclusive message to any MIDI devices.
-  void GrantSendMidiSysExMessage(int child_id);
-
   // Before servicing a child process's request for a URL, the browser should
   // call this method to determine whether the process has the capability to
   // request the URL.