[Presentation API] Add layout test for connection.close() and fix test failures

content/renderer/presentation/presentation_connection_proxy.cc

Index: content/renderer/presentation/presentation_connection_proxy.cc
diff --git a/content/renderer/presentation/presentation_connection_proxy.cc b/content/renderer/presentation/presentation_connection_proxy.cc
index aebff14183ac5a7de998df1213d7c7f8da41c179..c4dc82579649722450463e3477e6a700f4f41dc1 100644
--- a/content/renderer/presentation/presentation_connection_proxy.cc
+++ b/content/renderer/presentation/presentation_connection_proxy.cc
@@ -67,8 +67,7 @@ void PresentationConnectionProxy::DidChangeState(
     source_connection_->didChangeState(
         blink::WebPresentationConnectionState::Connected);
   } else if (state == content::PRESENTATION_CONNECTION_STATE_CLOSED) {
-    source_connection_->didChangeState(
-        blink::WebPresentationConnectionState::Closed);
+    source_connection_->didClose();
   } else {
     NOTREACHED();
   }
@@ -76,8 +75,7 @@ void PresentationConnectionProxy::DidChangeState(
 
 void PresentationConnectionProxy::OnClose() {
   DCHECK(target_connection_ptr_);
-  source_connection_->didChangeState(
-      blink::WebPresentationConnectionState::Closed);
+  source_connection_->didClose();
   target_connection_ptr_->DidChangeState(
       content::PRESENTATION_CONNECTION_STATE_CLOSED);
 }