Revert of Reland: Make the CPDFXFA_App non-global

fxjs/fxjs_v8.cpp

Index: fxjs/fxjs_v8.cpp
diff --git a/fxjs/fxjs_v8.cpp b/fxjs/fxjs_v8.cpp
index 5ce8c475698b2e831223d84f76e170cc8bec7ee6..d74d355dc971510eb2c1fa1739c0fbfd2f8d3d88 100644
--- a/fxjs/fxjs_v8.cpp
+++ b/fxjs/fxjs_v8.cpp
@@ -232,6 +232,14 @@
       pIsolate->GetCurrentContext()->GetAlignedPointerFromEmbedderData(
           kPerContextDataIndex));
 }
+
+#ifdef PDF_ENABLE_XFA
+// static
+void CFXJS_Engine::SetForV8Context(v8::Local<v8::Context> v8Context,
+                                   CFXJS_Engine* pEngine) {
+  v8Context->SetAlignedPointerInEmbedderData(kPerContextDataIndex, pEngine);
+}
+#endif  // PDF_ENABLE_XFA
 
 // static
 int CFXJS_Engine::GetObjDefnID(v8::Local<v8::Object> pObj) {