Presentation API: ignore presentation id passed to startSession().

content/renderer/presentation/presentation_dispatcher.cc

Index: content/renderer/presentation/presentation_dispatcher.cc
diff --git a/content/renderer/presentation/presentation_dispatcher.cc b/content/renderer/presentation/presentation_dispatcher.cc
index f2029883f0b60fe6837857a73016d36a36decb50..0f504639b8bea3515629c802fa04f573896c9190 100644
--- a/content/renderer/presentation/presentation_dispatcher.cc
+++ b/content/renderer/presentation/presentation_dispatcher.cc
@@ -111,6 +111,12 @@ void PresentationDispatcher::startSession(
     const blink::WebString& presentationUrl,
     const blink::WebString& presentationId,
     blink::WebPresentationSessionClientCallbacks* callback) {
+  startSession(presentationUrl, callback);
+}
+
+void PresentationDispatcher::startSession(
+    const blink::WebString& presentationUrl,
+    blink::WebPresentationSessionClientCallbacks* callback) {
   DCHECK(callback);
   ConnectToPresentationServiceIfNeeded();
 
@@ -119,7 +125,6 @@ void PresentationDispatcher::startSession(
   // to be destroyed so we transfer its ownership to the mojo callback.
   presentation_service_->StartSession(
       presentationUrl.utf8(),
-      presentationId.utf8(),
       base::Bind(&PresentationDispatcher::OnSessionCreated,
           base::Unretained(this),
           base::Owned(callback)));