Fix save/restore of form control contents when reloading (bug 294258). r=sicking, sr=bzbarsky.

xpfe/components/shistory/src/nsSHEntry.cpp

@@ -538,7 +538,7 @@ nsSHEntry::SyncPresentationState()
 
   // If not, then nuke all of the presentation-related members.
   if (mContentViewer)
-    mContentViewer->SetHistoryEntry(nsnull);
+    mContentViewer->ClearHistoryEntry();
 
   mContentViewer = nsnull;
   mSticky = PR_TRUE;