Made conversions from PassRefPtr to WebPrivatePtr move only.

third_party/WebKit/Source/web/WebSerializedScriptValue.cpp

 /*
  * Copyright (C) 2010 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 59 matching lines @@
   return private_->ToWireString();
 }
 
 v8::Local<v8::Value> WebSerializedScriptValue::Deserialize(
     v8::Isolate* isolate) {
   return private_->Deserialize(isolate);
 }
 
 WebSerializedScriptValue::WebSerializedScriptValue(
     PassRefPtr<SerializedScriptValue> value)
-    : private_(value) {}
+    : private_(std::move(value)) {}
 
 WebSerializedScriptValue& WebSerializedScriptValue::operator=(
     PassRefPtr<SerializedScriptValue> value) {
-  private_ = value;
+  private_ = std::move(value);
   return *this;
 }
 
 WebSerializedScriptValue::operator PassRefPtr<SerializedScriptValue>() const {
   return private_.Get();
 }
 
 }  // namespace blink