Implementing closeSession from WebPresentationClient to PresentationService.

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 839b5103d3cffbe6fd723efad54c2e06c098e2ef..3e584b0a11d698cb00771e3c4342e9a521a5f43e 100644
--- a/content/renderer/presentation/presentation_dispatcher.cc
+++ b/content/renderer/presentation/presentation_dispatcher.cc
@@ -116,6 +116,16 @@ void PresentationDispatcher::joinSession(
           base::Owned(callback)));
 }
 
+void PresentationDispatcher::closeSession(
+    const blink::WebString& presentationUrl,
+    const blink::WebString& presentationId) {
+  ConnectToPresentationServiceIfNeeded();
+
+  presentation_service_->CloseSession(
+      presentationUrl.utf8(),
+      presentationId.utf8());
+}
+
 void PresentationDispatcher::DidChangeDefaultPresentation() {
   GURL presentation_url(GetPresentationURLFromFrame(render_frame()));