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 4e6a3c7281915178832a93451171719b7b46ed64..24d4dcb7b2a85484eaeaff1910e9873672306a49 100644
--- a/content/renderer/presentation/presentation_dispatcher.cc
+++ b/content/renderer/presentation/presentation_dispatcher.cc
@@ -114,6 +114,12 @@ 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();
 
@@ -122,7 +128,6 @@ 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)));