[PresentationAPI] Use KURL and WebURL in place of string types.

content/renderer/presentation/presentation_connection_client.h

 // Copyright 2015 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.
 
 #ifndef CONTENT_RENDERER_PRESENTATION_PRESENTATION_SESSION_CLIENT_H_
 #define CONTENT_RENDERER_PRESENTATION_PRESENTATION_SESSION_CLIENT_H_
 
 #include "base/compiler_specific.h"
 #include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/modules/presentation/WebPresentationConnectionClient.h"
 #include "third_party/WebKit/public/platform/modules/presentation/presentation.mojom.h"
 #include "url/gurl.h"
 
 namespace content {
 
 // PresentationConnectionClient is passed to the Blink layer if presentation
 // session has been created successfully. Owned by the callback.
 class CONTENT_EXPORT PresentationConnectionClient
     : public NON_EXPORTED_BASE(blink::WebPresentationConnectionClient) {
  public:
   explicit PresentationConnectionClient(
       blink::mojom::PresentationSessionInfoPtr session_info);
   explicit PresentationConnectionClient(const GURL& url,
                                         const mojo::String& id);
   ~PresentationConnectionClient() override;
 
   // WebPresentationConnectionClient implementation.
-  blink::WebString getUrl() override;
+  blink::WebURL getUrl() override;
   blink::WebString getId() override;
 
  private:
-  blink::WebString url_;
+  blink::WebURL url_;
   blink::WebString id_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PRESENTATION_PRESENTATION_SESSION_CLIENT_H_