Store object definition ID in each js_class.

fpdfsdk/src/javascript/JS_EventHandler.cpp

Index: fpdfsdk/src/javascript/JS_EventHandler.cpp
diff --git a/fpdfsdk/src/javascript/JS_EventHandler.cpp b/fpdfsdk/src/javascript/JS_EventHandler.cpp
index 42d61f4c1e49060c1337fd27c5fa3a4aaea9c836..dd5c4427cea67073f4f91bbe58c1db41c06c167b 100644
--- a/fpdfsdk/src/javascript/JS_EventHandler.cpp
+++ b/fpdfsdk/src/javascript/JS_EventHandler.cpp
@@ -613,13 +613,12 @@ FX_BOOL CJS_EventHandler::Shift() {
 Field* CJS_EventHandler::Source() {
   CJS_Runtime* pRuntime = m_pJSContext->GetJSRuntime();
   v8::Local<v8::Object> pDocObj = FXJS_NewFxDynamicObj(
-      pRuntime->GetIsolate(), m_pJSContext,
-      FXJS_GetObjDefnID(pRuntime->GetIsolate(), L"Document"));
-  ASSERT(pDocObj.IsEmpty() == FALSE);
-  v8::Local<v8::Object> pFieldObj =
-      FXJS_NewFxDynamicObj(pRuntime->GetIsolate(), m_pJSContext,
-                           FXJS_GetObjDefnID(pRuntime->GetIsolate(), L"Field"));
-  ASSERT(pFieldObj.IsEmpty() == FALSE);
+      pRuntime->GetIsolate(), m_pJSContext, CJS_Document::g_nObjDefnID);
+  ASSERT(!pDocObj.IsEmpty());
+
+  v8::Local<v8::Object> pFieldObj = FXJS_NewFxDynamicObj(
+      pRuntime->GetIsolate(), m_pJSContext, CJS_Field::g_nObjDefnID);
+  ASSERT(!pFieldObj.IsEmpty());
 
   CJS_Document* pJSDocument =
       (CJS_Document*)FXJS_GetPrivate(pRuntime->GetIsolate(), pDocObj);
@@ -637,13 +636,12 @@ Field* CJS_EventHandler::Source() {
 Field* CJS_EventHandler::Target_Field() {
   CJS_Runtime* pRuntime = m_pJSContext->GetJSRuntime();
   v8::Local<v8::Object> pDocObj = FXJS_NewFxDynamicObj(
-      pRuntime->GetIsolate(), m_pJSContext,
-      FXJS_GetObjDefnID(pRuntime->GetIsolate(), L"Document"));
-  ASSERT(pDocObj.IsEmpty() == FALSE);
-  v8::Local<v8::Object> pFieldObj =
-      FXJS_NewFxDynamicObj(pRuntime->GetIsolate(), m_pJSContext,
-                           FXJS_GetObjDefnID(pRuntime->GetIsolate(), L"Field"));
-  ASSERT(pFieldObj.IsEmpty() == FALSE);
+      pRuntime->GetIsolate(), m_pJSContext, CJS_Document::g_nObjDefnID);
+  ASSERT(!pDocObj.IsEmpty());
+
+  v8::Local<v8::Object> pFieldObj = FXJS_NewFxDynamicObj(
+      pRuntime->GetIsolate(), m_pJSContext, CJS_Field::g_nObjDefnID);
+  ASSERT(!pFieldObj.IsEmpty());
 
   CJS_Document* pJSDocument =
       (CJS_Document*)FXJS_GetPrivate(pRuntime->GetIsolate(), pDocObj);