Pass CFX_WideString further down widget callers

fpdfsdk/javascript/Field.cpp

Index: fpdfsdk/javascript/Field.cpp
diff --git a/fpdfsdk/javascript/Field.cpp b/fpdfsdk/javascript/Field.cpp
index 3f5e5e1b0f57ae9aabb2675b4a0705d8e1bee752..ab779f1c9487c3b01b0a5378551c8cec391121bd 100644
--- a/fpdfsdk/javascript/Field.cpp
+++ b/fpdfsdk/javascript/Field.cpp
@@ -273,8 +273,7 @@ void Field::UpdateFormField(CPDFSDK_Document* pDocument,
         CPDFSDK_Widget::Observer observer(&pAnnot);
         CFX_WideString sValue = pWidget->OnFormat(bFormatted);
         if (pAnnot) {
-          pWidget->ResetAppearance(bFormatted ? sValue.c_str() : nullptr,
-                                   FALSE);
+          pWidget->ResetAppearance(bFormatted ? &sValue : nullptr, FALSE);
         }
       }
     } else {
@@ -310,12 +309,9 @@ void Field::UpdateFormControl(CPDFSDK_Document* pDocument,
       int nFieldType = pWidget->GetFieldType();
       if (nFieldType == FIELDTYPE_COMBOBOX ||
           nFieldType == FIELDTYPE_TEXTFIELD) {
-        FX_BOOL bFormated = FALSE;
-        CFX_WideString sValue = pWidget->OnFormat(bFormated);
-        if (bFormated)
-          pWidget->ResetAppearance(sValue.c_str(), FALSE);
-        else
-          pWidget->ResetAppearance(nullptr, FALSE);
+        FX_BOOL bFormatted = FALSE;
+        CFX_WideString sValue = pWidget->OnFormat(bFormatted);
+        pWidget->ResetAppearance(bFormatted ? &sValue : nullptr, FALSE);
       } else {
         pWidget->ResetAppearance(nullptr, FALSE);
       }