Remove unused prefs/api/resource for setPageEncoding

third_party/WebKit/Source/core/html/parser/TextResourceDecoder.cpp

Index: third_party/WebKit/Source/core/html/parser/TextResourceDecoder.cpp
diff --git a/third_party/WebKit/Source/core/html/parser/TextResourceDecoder.cpp b/third_party/WebKit/Source/core/html/parser/TextResourceDecoder.cpp
index 6c97585b46d66485714cb03b9010c6ab26300ead..6b89e4a31499181979ba1e2ceac1982435e9452c 100644
--- a/third_party/WebKit/Source/core/html/parser/TextResourceDecoder.cpp
+++ b/third_party/WebKit/Source/core/html/parser/TextResourceDecoder.cpp
@@ -137,8 +137,13 @@ void TextResourceDecoder::setEncoding(const WTF::TextEncoding& encoding, Encodin
     if (!encoding.isValid())
         return;
 
+    // Default encoding for XML content should remain as UTF-8 even if the autodetection comes into play

[Jinsuk Kim, 2016/09/05 10:08:50]

This change was made to make following XML tests pass:

fast/encoding/default-xhtml-encoding.xhtml 
fast/encoding/meta-in-xhtml.xhtml
dom/xhtml/level3/core/documentgetinputencoding01.xhtml

[tkent, 2016/09/05 23:53:45]

Why did they fail?  Did the other part of this CL change an XML behavior?

+    // to detect it as Latin-1.
+    if (m_contentType == XMLContent && source == EncodingFromContentSniffing && encoding == Latin1Encoding())
+        return;
+
     // When encoding comes from meta tag (i.e. it cannot be XML files sent via XHR),
-    // treat x-user-defined as windows-1252 (bug 18270)
+    // treat x-user-defined as windows-1252 (bug 18270).
     if (source == EncodingFromMetaTag && !strcasecmp(encoding.name(), "x-user-defined"))
         m_encoding = "windows-1252";
     else if (source == EncodingFromMetaTag || source == EncodingFromXMLHeader || source == EncodingFromCSSCharset)