Fix rtl text shifting in PopupListBox

Source/web/PopupListBox.h

Index: Source/web/PopupListBox.h
diff --git a/Source/web/PopupListBox.h b/Source/web/PopupListBox.h
index a78538a77a106256eaff19bf045995b8d6ad4191..6b797790e2480ee1dd7b1df5248b0ac8761f459d 100644
--- a/Source/web/PopupListBox.h
+++ b/Source/web/PopupListBox.h
@@ -145,6 +145,8 @@ public:
     // Gets the height of a row.
     int getRowHeight(int index);
 
+    int getRowBaseWidth(int index);
+
     virtual void setMaxHeight(int maxHeight) OVERRIDE { m_maxHeight = maxHeight; }
 
     void setMaxWidth(int maxWidth) { m_maxWindowWidth = maxWidth; }