Don't initialize ICU replacement character for UTF-32 encodings

third_party/WebKit/Source/wtf/text/TextEncoding.h

Index: third_party/WebKit/Source/wtf/text/TextEncoding.h
diff --git a/third_party/WebKit/Source/wtf/text/TextEncoding.h b/third_party/WebKit/Source/wtf/text/TextEncoding.h
index d81a83b04f4a30c9305843e23d57f147dd2f19ff..f7285959d6f448ef41f092f9b5ba05e3f75aedfb 100644
--- a/third_party/WebKit/Source/wtf/text/TextEncoding.h
+++ b/third_party/WebKit/Source/wtf/text/TextEncoding.h
@@ -78,6 +78,7 @@ WTF_EXPORT const TextEncoding& ASCIIEncoding();
 WTF_EXPORT const TextEncoding& Latin1Encoding();
 WTF_EXPORT const TextEncoding& UTF16BigEndianEncoding();
 WTF_EXPORT const TextEncoding& UTF16LittleEndianEncoding();
+WTF_EXPORT const TextEncoding& UTF32Encoding();
 WTF_EXPORT const TextEncoding& UTF32BigEndianEncoding();
 WTF_EXPORT const TextEncoding& UTF32LittleEndianEncoding();
 WTF_EXPORT const TextEncoding& UTF8Encoding();
@@ -89,6 +90,7 @@ using WTF::ASCIIEncoding;
 using WTF::Latin1Encoding;
 using WTF::UTF16BigEndianEncoding;
 using WTF::UTF16LittleEndianEncoding;
+using WTF::UTF32Encoding;
 using WTF::UTF32BigEndianEncoding;
 using WTF::UTF32LittleEndianEncoding;
 using WTF::UTF8Encoding;