Refactor WebRTC certificate generation to use WebPassOwnPtr.

third_party/WebKit/public/platform/WebRTCCertificateGenerator.h

 /*
  * Copyright (C) 2015 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebRTCCertificateGenerator_h
 #define WebRTCCertificateGenerator_h
 
 #include "public/platform/WebCallbacks.h"
+#include "public/platform/WebPassOwnPtr.h"
 #include "public/platform/WebRTCCertificate.h"
 #include "public/platform/WebRTCKeyParams.h"
 #include "public/platform/WebURL.h"
 
 namespace blink {
 
+using WebRTCCertificateCallback = WebCallbacks<WebPassOwnPtr<WebRTCCertificate>, void>;
+
 // Interface defining a class that can generate WebRTCCertificates asynchronously.
 class WebRTCCertificateGenerator {
 public:
     virtual ~WebRTCCertificateGenerator() {}
 
-    // Start generating a certificate asynchronously. The |observer| is invoked on the
+    // Start generating a certificate asynchronously. |observer| is invoked on the
     // same thread that called generateCertificate when the operation is completed.
     virtual void generateCertificate(
         const WebRTCKeyParams&,
         const WebURL&,
         const WebURL& firstPartyForCookies,
-        WebCallbacks<WebRTCCertificate*, void>* observer) = 0;
+        WebPassOwnPtr<WebRTCCertificateCallback> observer) = 0;
 
     // Determines if the parameters are supported by generateCertificate.
     // For example, if the number of bits of some parameter is too small or too large we
     // may want to reject it for security or performance reasons.
     virtual bool isSupportedKeyParams(const WebRTCKeyParams&) = 0;
 };
 
 } // namespace blink
 
 #endif // WebRTCCertificateGenerator_h