Store object definition ID in each js_class.

fpdfsdk/src/javascript/Field.cpp

Index: fpdfsdk/src/javascript/Field.cpp
diff --git a/fpdfsdk/src/javascript/Field.cpp b/fpdfsdk/src/javascript/Field.cpp
index 140bb422feb52a460fb0a29b987815a4535878f7..848c67d331f8d8dab5ba82dbc3d813204bd474b7 100644
--- a/fpdfsdk/src/javascript/Field.cpp
+++ b/fpdfsdk/src/javascript/Field.cpp
@@ -3309,9 +3309,8 @@ FX_BOOL Field::buttonGetIcon(IFXJS_Context* cc,
 
   CJS_Context* pContext = (CJS_Context*)cc;
   CJS_Runtime* pRuntime = pContext->GetJSRuntime();
-  v8::Local<v8::Object> pObj =
-      FXJS_NewFxDynamicObj(pRuntime->GetIsolate(), pContext,
-                           FXJS_GetObjDefnID(pRuntime->GetIsolate(), L"Icon"));
+  v8::Local<v8::Object> pObj = FXJS_NewFxDynamicObj(
+      pRuntime->GetIsolate(), pContext, CJS_Icon::g_nObjDefnID);
   ASSERT(pObj.IsEmpty() == FALSE);
 
   CJS_Icon* pJS_Icon = (CJS_Icon*)FXJS_GetPrivate(pRuntime->GetIsolate(), pObj);
@@ -3520,9 +3519,8 @@ FX_BOOL Field::getArray(IFXJS_Context* cc,
   for (int j = 0, jsz = swSort.GetSize(); j < jsz; j++) {
     nonstd::unique_ptr<CFX_WideString> pStr(swSort.GetAt(j));
     v8::Local<v8::Object> pObj = FXJS_NewFxDynamicObj(
-        pRuntime->GetIsolate(), pContext,
-        FXJS_GetObjDefnID(pRuntime->GetIsolate(), L"Field"));
-    ASSERT(pObj.IsEmpty() == FALSE);
+        pRuntime->GetIsolate(), pContext, CJS_Field::g_nObjDefnID);
+    ASSERT(!pObj.IsEmpty());
 
     CJS_Field* pJSField =
         (CJS_Field*)FXJS_GetPrivate(pRuntime->GetIsolate(), pObj);