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/include/javascript/JS_Runtime.h b/fpdfsdk/include/javascript/JS_Runtime.h
index f0285b2..b53e50e 100644
--- a/fpdfsdk/include/javascript/JS_Runtime.h
+++ b/fpdfsdk/include/javascript/JS_Runtime.h
@@ -64,7 +64,7 @@
   CJS_FieldEvent* m_pFieldEventPath;
   v8::Isolate* m_isolate;
   bool m_isolateManaged;
-  nonstd::unique_ptr<JS_ArrayBufferAllocator> m_pArrayBufferAllocator;
+  nonstd::unique_ptr<FXJS_ArrayBufferAllocator> m_pArrayBufferAllocator;
   v8::Global<v8::Context> m_context;
 };