WTF: Make PassOwnPtr<T> move-only.

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

Index: third_party/WebKit/Source/platform/exported/WebBlobData.cpp
diff --git a/third_party/WebKit/Source/platform/exported/WebBlobData.cpp b/third_party/WebKit/Source/platform/exported/WebBlobData.cpp
index e68dee06f2272be825dca82fec3cf074ae7bc107..6b67d5888aa091593885198e2cd540a066923757 100644
--- a/third_party/WebKit/Source/platform/exported/WebBlobData.cpp
+++ b/third_party/WebKit/Source/platform/exported/WebBlobData.cpp
@@ -94,14 +94,14 @@ WebString WebBlobData::contentType() const
     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;
 }