Remove FX_WORD in favor of uint16_t.

core/fxcrt/fx_unicode.cpp

Index: core/fxcrt/fx_unicode.cpp
diff --git a/core/fxcrt/fx_unicode.cpp b/core/fxcrt/fx_unicode.cpp
index 140bab0b279efaebdc3ae6283365317c1f929b05..9094c6529456aecf1bda878825e2de526aab7464 100644
--- a/core/fxcrt/fx_unicode.cpp
+++ b/core/fxcrt/fx_unicode.cpp
@@ -9,7 +9,7 @@
 FX_DWORD FX_GetUnicodeProperties(FX_WCHAR wch) {
   size_t idx = static_cast<size_t>(wch);
   if (idx < kTextLayoutCodePropertiesSize)
-    return kTextLayoutCodeProperties[(FX_WORD)wch];
+    return kTextLayoutCodeProperties[(uint16_t)wch];
   return 0;
 }