Revert "Moved text decoding to the parser thread"

Source/core/fetch/TextResourceDecoder.h

Index: Source/core/fetch/TextResourceDecoder.h
diff --git a/Source/core/html/parser/TextResourceDecoder.h b/Source/core/fetch/TextResourceDecoder.h
similarity index 96%
rename from Source/core/html/parser/TextResourceDecoder.h
rename to Source/core/fetch/TextResourceDecoder.h
index 5ad2ad561f8e11b9e7bb4e5e42807a5af2bedfdf..4c7734781487fe8e1f3cdd0cc5ec5cc53a8b076d 100644
--- a/Source/core/html/parser/TextResourceDecoder.h
+++ b/Source/core/fetch/TextResourceDecoder.h
@@ -28,7 +28,6 @@
 
 namespace WebCore {
 
-class DocumentEncodingData;
 class HTMLMetaCharsetParser;
 
 class TextResourceDecoder {
@@ -73,7 +72,7 @@ public:
 private:
     TextResourceDecoder(const String& mimeType, const WTF::TextEncoding& defaultEncoding, bool usesEncodingDetector);
 
-    enum ContentType { PlainTextContent, HTMLContent, XMLContent, CSSContent }; // PlainText only checks for BOM.
+    enum ContentType { PlainText, HTML, XML, CSS }; // PlainText only checks for BOM.
     static ContentType determineContentType(const String& mimeType);
     static const WTF::TextEncoding& defaultEncoding(ContentType, const WTF::TextEncoding& defaultEncoding);