Presentation API: Blink changes to allow getAvailability() to be rejected.

Source/modules/presentation/Presentation.cpp

Index: Source/modules/presentation/Presentation.cpp
diff --git a/Source/modules/presentation/Presentation.cpp b/Source/modules/presentation/Presentation.cpp
index 98cfa5264b8f6032c50c8ac27b33c48db7adc7b1..a18cf57e4bbf26e0dcce09a33172b2bb2216c098 100644
--- a/Source/modules/presentation/Presentation.cpp
+++ b/Source/modules/presentation/Presentation.cpp
@@ -122,7 +122,7 @@ void Presentation::didChangeSessionState(WebPresentationSessionClient* sessionCl
     if (session)
         session->didChangeState(sessionState);
 
-    PresentationSession::dispose(sessionClient);
+    delete sessionClient;
 }
 
 void Presentation::didReceiveSessionTextMessage(WebPresentationSessionClient* sessionClient, const String& message)
@@ -131,7 +131,7 @@ void Presentation::didReceiveSessionTextMessage(WebPresentationSessionClient* se
     if (session)
         session->didReceiveTextMessage(message);
 
-    PresentationSession::dispose(sessionClient);
+    delete sessionClient;
 }
 
 void Presentation::registerSession(PresentationSession* session)