Remove unused text encoding quirks.

Source/wtf/text/TextEncoding.cpp

Index: Source/wtf/text/TextEncoding.cpp
diff --git a/Source/wtf/text/TextEncoding.cpp b/Source/wtf/text/TextEncoding.cpp
index f232e57b2acc6613c5ad807f290a396013ef1504..293afb4ecb6a048f96173b28440353ea1db703d8 100644
--- a/Source/wtf/text/TextEncoding.cpp
+++ b/Source/wtf/text/TextEncoding.cpp
@@ -45,7 +45,6 @@ static const TextEncoding& UTF7Encoding()
 
 TextEncoding::TextEncoding(const char* name)
     : m_name(atomicCanonicalTextEncodingName(name))
-    , m_backslashAsCurrencySymbol(backslashAsCurrencySymbol())
 {
     // Aliases are valid, but not "replacement" itself.
     if (m_name && isReplacementEncoding(name))
@@ -54,7 +53,6 @@ TextEncoding::TextEncoding(const char* name)
 
 TextEncoding::TextEncoding(const String& name)
     : m_name(atomicCanonicalTextEncodingName(name))
-    , m_backslashAsCurrencySymbol(backslashAsCurrencySymbol())
 {
     // Aliases are valid, but not "replacement" itself.
     if (m_name && isReplacementEncoding(name))
@@ -134,11 +132,6 @@ bool TextEncoding::usesVisualOrdering() const
     return m_name == a;
 }
 
-UChar TextEncoding::backslashAsCurrencySymbol() const
-{
-    return shouldShowBackslashAsCurrencySymbolIn(m_name) ? 0x00A5 : '\\';
-}
-
 bool TextEncoding::isNonByteBasedEncoding() const
 {
     if (noExtendedTextEncodingNameUsed()) {