Merge to XFA: Ensure functions in FXJS_V8 are prefixed by FXJS_.

Manual edits:
  fpdfsdk/include/javascript/JS_Define.h
  fpdfsdk/src/fpdfxfa/fpdfxfa_app.cpp
  fpdfsdk/src/javascript/Document.cpp
  fpdfsdk/src/javascript/JS_Runtime.cpp
  fpdfsdk/src/jsapi/fxjs_v8.cpp

(cherry picked from commit 506df426d5d64d68e9dc27ffebcf56f6c6a1bccf)
Original Review URL: https://codereview.chromium.org/1347833002 .

(cherry picked from commit 455019ca48f60bd285e043986471f51f17c69a0d)
Original Review URL: https://codereview.chromium.org/1349783003 .

(cherry picked from commit 1af240cc45480520b447be767686e73a29c48f9e)
Original Review URL: https://codereview.chromium.org/1348693003 .

R=thestig@chromium.org

Review URL: https://codereview.chromium.org/1356563003 .
diff --git a/fpdfsdk/src/javascript/PublicMethods.cpp b/fpdfsdk/src/javascript/PublicMethods.cpp
index c1e0cfc..17164cc 100644
--- a/fpdfsdk/src/javascript/PublicMethods.cpp
+++ b/fpdfsdk/src/javascript/PublicMethods.cpp
@@ -1936,7 +1936,7 @@
 
   CJS_Value params1 = params[1];
 
-  if (!params1.IsArrayObject() && params1.GetType() != VT_string) {
+  if (!params1.IsArrayObject() && params1.GetType() != CJS_Value::VT_string) {
     sError = JSGetStringFromID(pContext, IDS_STRING_JSPARAMERROR);
     return FALSE;
   }