diff -r 7540298fafa1 -r 44a2da4a2ab2 widget/xpwidgets/nsTransferable.cpp
--- a/widget/xpwidgets/nsTransferable.cpp	Thu Jan 15 21:13:52 2015 +0100
+++ b/widget/xpwidgets/nsTransferable.cpp	Fri Jan 16 04:50:19 2015 +0100
@@ -399,17 +399,11 @@
 
   // first check our intrinsic flavors to see if one has been registered.
   uint32_t i = 0;
-  bool aIsPrivBrowsing = false;
   for (i = 0; i < mDataArray.Length(); ++i) {
     DataStruct& data = mDataArray.ElementAt(i);
     if ( data.GetFlavor().Equals(aFlavor) ) {
-      if ( NS_SUCCEEDED(GetIsPrivateData(&aIsPrivBrowsing)) ) {
-        data.SetData ( aData, aDataLen, aIsPrivBrowsing );
-        return NS_OK;
-      }
-      else {                     // call to GetIsPrivateData() failed,
-        return NS_ERROR_FAILURE; // we didn't SetData(), generic error
-      }
+      data.SetData ( aData, aDataLen, mPrivateData);
+      return NS_OK;
     }
   }
 
@@ -418,20 +412,14 @@
     for (i = 0; i < mDataArray.Length(); ++i) {
       DataStruct& data = mDataArray.ElementAt(i);
       bool canConvert = false;
-      bool aIsPrivBrowsing = false;
       mFormatConv->CanConvert(aFlavor, data.GetFlavor().get(), &canConvert);
 
       if ( canConvert ) {
         nsCOMPtr<nsISupports> ConvertedData;
         uint32_t ConvertedLen;
         mFormatConv->Convert(aFlavor, aData, aDataLen, data.GetFlavor().get(), getter_AddRefs(ConvertedData), &ConvertedLen);
-        if (NS_SUCCEEDED(GetIsPrivateData(&aIsPrivBrowsing))) {
-          data.SetData(ConvertedData, ConvertedLen, aIsPrivBrowsing);
-          return NS_OK;
-        }
-        else {                     // call to GetIsPrivateData() failed,
-          return NS_ERROR_FAILURE; // we didn't SetData(), generic error
-        }
+        data.SetData(ConvertedData, ConvertedLen, mPrivateData);
+        return NS_OK;
       }
     }
   }