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

third_party/WebKit/Source/wtf/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 assert(!is_ios)
 
 import("//testing/test.gni")
 import("//third_party/WebKit/Source/config.gni")
 
 visibility = [
@@ skipping 323 matching lines @@
     "text/StringBuilderTest.cpp",
     "text/StringImplTest.cpp",
     "text/StringOperatorsTest.cpp",
     "text/StringViewTest.cpp",
     "text/TextCodecICUTest.cpp",
     "text/TextCodecLatin1Test.cpp",
     "text/TextCodecReplacementTest.cpp",
     "text/TextCodecTest.cpp",
     "text/TextCodecUTF8Test.cpp",
     "text/TextCodecUserDefinedTest.cpp",
+    "text/TextEncodingTest.cpp",
     "text/WTFStringTest.cpp",
     "typed_arrays/ArrayBufferBuilderTest.cpp",
   ]
 
   # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 
   if (is_win) {
     cflags = [ "/wd4068" ]  # Unknown pragma.
   }
 
   configs += [ "//third_party/WebKit/Source:config" ]
 
   deps = [
     ":wtf",
     "//base",
     "//base/test:test_support",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }