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

third_party/WebKit/Source/modules/presentation/PresentationConnection.h

Index: third_party/WebKit/Source/modules/presentation/PresentationConnection.h
diff --git a/third_party/WebKit/Source/modules/presentation/PresentationConnection.h b/third_party/WebKit/Source/modules/presentation/PresentationConnection.h
index 263baa97f7bbc706b73f845e192700ee03513e70..fceb2e020d4d94e09f47ea55b7c55edbc5ef990e 100644
--- a/third_party/WebKit/Source/modules/presentation/PresentationConnection.h
+++ b/third_party/WebKit/Source/modules/presentation/PresentationConnection.h
@@ -81,14 +81,13 @@ class PresentationConnection final : public EventTargetWithInlineData,
   // |url|.
   bool matches(const String& id, const KURL&) const;
 
-  // Notifies the connection about its state change to 'closed'.
-  void didClose(WebPresentationConnectionCloseReason, const String& message);
-
   // WebPresentationConnection implementation.
   void bindProxy(std::unique_ptr<WebPresentationConnectionProxy>) override;
   void didReceiveTextMessage(const WebString& message) override;
   void didReceiveBinaryMessage(const uint8_t* data, size_t length) override;
   void didChangeState(WebPresentationConnectionState) override;
+  void didClose(WebPresentationConnectionCloseReason,
+                const WebString& message) override;
 
   WebPresentationConnectionState getState();
   void didChangeState(WebPresentationConnectionState, bool shouldDispatchEvent);