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/JS_Object.cpp b/fpdfsdk/src/javascript/JS_Object.cpp
index 17e987d..6891e6f 100644
--- a/fpdfsdk/src/javascript/JS_Object.cpp
+++ b/fpdfsdk/src/javascript/JS_Object.cpp
@@ -74,7 +74,7 @@
   CJS_Object* pJSObj = data.GetParameter();
   pJSObj->ExitInstance();
   delete pJSObj;
-  JS_FreePrivate(data.GetInternalField(0));
+  FXJS_FreePrivate(data.GetInternalField(0));
 }
 
 void DisposeObject(const v8::WeakCallbackInfo<CJS_Object>& data) {