Refactoring: Simplify DocumentWriter by reorganizing its lifetime.

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 26 matching lines @@
 #include "weborigin/SecurityOrigin.h"
 
 namespace WebCore {
 
 static inline bool canReferToParentFrameEncoding(const Frame* frame, const Frame* parentFrame)
 {
     return parentFrame && parentFrame->document()->securityOrigin()->canAccess(frame->document()->securityOrigin());
 }
 
 
-TextResourceDecoderBuilder::TextResourceDecoderBuilder()
-    : m_encodingWasChosenByUser(false)
+TextResourceDecoderBuilder::TextResourceDecoderBuilder(const String& mimeType, const String& encoding, bool encodingUserChoosen)
+    : m_mimeType(mimeType)
+    , m_encoding(encoding)
+    , m_encodingWasChosenByUser(encodingUserChoosen)
 {
 }
 
 TextResourceDecoderBuilder::~TextResourceDecoderBuilder()
 {
 }
 
 
 inline PassRefPtr<TextResourceDecoder> TextResourceDecoderBuilder::createDecoderInstance(Document* document)
 {
@@ skipping 30 matching lines @@
 }
 
 PassRefPtr<TextResourceDecoder> TextResourceDecoderBuilder::buildFor(Document* document)
 {
     RefPtr<TextResourceDecoder> decoder = createDecoderInstance(document);
     setupEncoding(decoder.get(), document);
     document->setDecoder(decoder);
     return decoder.release();
 }
 
-void TextResourceDecoderBuilder::setEncoding(const String& encoding, bool userChosen)
-{
-    m_encoding = encoding;
-    m_encodingWasChosenByUser = userChosen;
-}
-
 void TextResourceDecoderBuilder::clear()
 {
     if (!m_encodingWasChosenByUser)
         m_encoding = String();
 }
 
 }