WTF: Make PassOwnPtr<T> move-only.

third_party/WebKit/Source/platform/exported/WebBlobData.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. 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.
@@ skipping 76 matching lines @@
     ASSERT_NOT_REACHED();
     return false;
 }
 
 WebString WebBlobData::contentType() const
 {
     ASSERT(!isNull());
     return m_private->contentType();
 }
 
-WebBlobData::WebBlobData(const PassOwnPtr<BlobData>& data)
-    : m_private(data)
+WebBlobData::WebBlobData(PassOwnPtr<BlobData> data)
+    : m_private(std::move(data))
 {
 }
 
-WebBlobData& WebBlobData::operator=(const PassOwnPtr<BlobData>& data)
+WebBlobData& WebBlobData::operator=(PassOwnPtr<BlobData> data)
 {
-    m_private.reset(data);
+    m_private.reset(std::move(data));
     return *this;
 }
 
 WebBlobData::operator PassOwnPtr<BlobData>()
 {
     return m_private.release();
 }
 
 } // namespace blink