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

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

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/presentation/PresentationConnection.h"
 
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/dom/DOMArrayBuffer.h"
 #include "core/dom/DOMArrayBufferView.h"
 #include "core/dom/Document.h"
@@ skipping 441 matching lines @@
     // Closed state is handled in |didClose()|.
     case WebPresentationConnectionState::Closed:
       NOTREACHED();
       return;
   }
   NOTREACHED();
 }
 
 void PresentationConnection::didClose(
     WebPresentationConnectionCloseReason reason,
-    const String& message) {
+    const WebString& message) {
   if (m_state == WebPresentationConnectionState::Closed)
     return;
 
   m_state = WebPresentationConnectionState::Closed;
   dispatchStateChangeEvent(PresentationConnectionCloseEvent::create(
       EventTypeNames::close, connectionCloseReasonToString(reason), message));
 }
 
 void PresentationConnection::didFinishLoadingBlob(DOMArrayBuffer* buffer) {
   ASSERT(!m_messages.isEmpty() && m_messages.first()->type == MessageTypeBlob);
@@ skipping 39 matching lines @@
 void PresentationConnection::tearDown() {
   // Cancel current Blob loading if any.
   if (m_blobLoader) {
     m_blobLoader->cancel();
     m_blobLoader.clear();
   }
   m_messages.clear();
 }
 
 }  // namespace blink