Remove OwnPtr::release() calls in core/ (part 4).

third_party/WebKit/Source/core/loader/TextResourceDecoderBuilder.cpp

 /*
  * Copyright (C) 2013 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 153 matching lines @@
 
         if (m_encoding.isEmpty())
             decoder->setEncoding(parentFrame->document()->encoding(), TextResourceDecoder::EncodingFromParentFrame);
     }
 }
 
 PassOwnPtr<TextResourceDecoder> TextResourceDecoderBuilder::buildFor(Document* document)
 {
     OwnPtr<TextResourceDecoder> decoder = createDecoderInstance(document);
     setupEncoding(decoder.get(), document);
-    return decoder.release();
+    return decoder;
 }
 
 void TextResourceDecoderBuilder::clear()
 {
     m_encoding = nullAtom;
 }
 
 } // namespace blink