Make down-conversion explicit from CFX_Widetring to CFX_WideStringC.

xfa/fxfa/parser/xfa_layout_itemlayout.cpp

Index: xfa/fxfa/parser/xfa_layout_itemlayout.cpp
diff --git a/xfa/fxfa/parser/xfa_layout_itemlayout.cpp b/xfa/fxfa/parser/xfa_layout_itemlayout.cpp
index 0f22a27bd71f6a51608d28fa86e9f947ba5cca1e..270a44534351152880be2994b6a043e38f237101 100644
--- a/xfa/fxfa/parser/xfa_layout_itemlayout.cpp
+++ b/xfa/fxfa/parser/xfa_layout_itemlayout.cpp
@@ -1388,7 +1388,7 @@ void CXFA_ItemLayoutProcessor::DoLayoutTableContainer(CXFA_Node* pLayoutNode) {
         wsWidth = widths[i];
         wsWidth.TrimLeft(L' ');
         if (!wsWidth.IsEmpty()) {
-          CXFA_Measurement measure(wsWidth);
+          CXFA_Measurement measure(wsWidth.AsWideStringC());
           m_rgSpecifiedColumnWidths.Add(measure.ToUnit(XFA_UNIT_Pt));
         }
       }