Replace FX_UINT with unsigned int

Remove the FX_UINT typedef and update to use the actual unsigned int type.

Review-Url: https://codereview.chromium.org/2343693002
diff --git a/fpdfsdk/javascript/resource.cpp b/fpdfsdk/javascript/resource.cpp
index c4edeae..6113c54 100644
--- a/fpdfsdk/javascript/resource.cpp
+++ b/fpdfsdk/javascript/resource.cpp
@@ -6,7 +6,7 @@
 
 #include "fpdfsdk/javascript/resource.h"
 
-CFX_WideString JSGetStringFromID(FX_UINT id) {
+CFX_WideString JSGetStringFromID(uint32_t id) {
   switch (id) {
     case IDS_STRING_JSALERT:
       return L"Alert";