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

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

Index: third_party/WebKit/Source/wtf/text/TextEncoding.cpp
diff --git a/third_party/WebKit/Source/wtf/text/TextEncoding.cpp b/third_party/WebKit/Source/wtf/text/TextEncoding.cpp
index 69e1e20530bde606e07bd9b84092d01d6067febd..10e62ca03e5f9a0c81aff4a0c198104ee49266ce 100644
--- a/third_party/WebKit/Source/wtf/text/TextEncoding.cpp
+++ b/third_party/WebKit/Source/wtf/text/TextEncoding.cpp
@@ -101,7 +101,7 @@ bool TextEncoding::isNonByteBasedEncoding() const {
   }
 
   return *this == UTF16LittleEndianEncoding() ||
-         *this == UTF16BigEndianEncoding() ||
+         *this == UTF16BigEndianEncoding() || *this == UTF32Encoding() ||
          *this == UTF32BigEndianEncoding() ||
          *this == UTF32LittleEndianEncoding();
 }
@@ -156,6 +156,13 @@ const TextEncoding& UTF16LittleEndianEncoding() {
   return globalUTF16LittleEndianEncoding;
 }
 
+// UTF-32 is UTF-32LE with an implicit BOM.
+const TextEncoding& UTF32Encoding() {
+  DEFINE_THREAD_SAFE_STATIC_LOCAL(const TextEncoding, globalUTF32Encoding,
+                                  new TextEncoding("UTF-32"));
+  return globalUTF32Encoding;
+}
+
 const TextEncoding& UTF32BigEndianEncoding() {
   DEFINE_THREAD_SAFE_STATIC_LOCAL(const TextEncoding,
                                   globalUTF32BigEndianEncoding,