Presentation API: startSession() no longer takes a presentation id.

Source/modules/presentation/Presentation.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef Presentation_h
 #define Presentation_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "core/events/EventTarget.h"
 #include "core/frame/DOMWindowProperty.h"
@@ skipping 26 matching lines @@
     virtual ~Presentation();
 
     // EventTarget implementation.
     virtual const AtomicString& interfaceName() const override;
     virtual ExecutionContext* executionContext() const override;
 
     DECLARE_VIRTUAL_TRACE();
 
     PresentationSession* session() const;
 
-    ScriptPromise startSession(ScriptState*, const String& presentationUrl, const String& presentationId);
+    ScriptPromise startSession(ScriptState*, const String& presentationUrl);
     ScriptPromise joinSession(ScriptState*, const String& presentationUrl, const String& presentationId);
     ScriptPromise getAvailability(ScriptState*, const String& presentationUrl);
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(defaultsessionstart);
 
     // Called when the |defaultsessionstart| event needs to be fired.
     void didStartDefaultSession(PresentationSession*);
 
     // Called when the |onstatechange| event needs to be fired to the right session.
     void didChangeSessionState(WebPresentationSessionClient*, WebPresentationSessionState);
@@ skipping 13 matching lines @@
     // The session object provided to the presentation page. Not supported.
     Member<PresentationSession> m_session;
 
     // The sessions opened for this frame.
     HeapHashSet<Member<PresentationSession>> m_openSessions;
 };
 
 } // namespace blink
 
 #endif // Presentation_h