convert sc/../warnbox.hxx from String to OUString

Change-Id: I1a94de9d2afcf21bd7c46cedccf2189bf2f6285a

sc/source/ui/inc/warnbox.hxx

@@ -31,7 +31,7 @@ class ScCbWarningBox : public WarningBox
 public:
     /** @param rMsgStr  Resource ID for the message text.
         @param bDefYes  true = "Yes" focused, false = "No" focused. */
-                                ScCbWarningBox( Window* pParent, const String& rMsgStr, bool bDefYes = true );
+                                ScCbWarningBox( Window* pParent, const OUString& rMsgStr, bool bDefYes = true );
 
     /** Opens dialog if IsDialogEnabled() returns true.
         @descr  If after executing the dialog the checkbox "Do not show again" is set,

sc/source/ui/miscdlgs/warnbox.cxx

@@ -27,13 +27,13 @@
 
 // ============================================================================
 
-ScCbWarningBox::ScCbWarningBox( Window* pParent, const String& rMsgStr, bool bDefYes ) :
+ScCbWarningBox::ScCbWarningBox( Window* pParent, const OUString& rMsgStr, bool bDefYes ) :
     WarningBox( pParent, WB_YES_NO | (bDefYes ? WB_DEF_YES : WB_DEF_NO), rMsgStr )
 {
     // By default, the check box is ON, and the user needs to un-check it to
     // disable all future warnings.
     SetCheckBoxState(true);
-    SetCheckBoxText(String(ScResId(SCSTR_WARN_ME_IN_FUTURE_CHECK)));
+    SetCheckBoxText(ScResId(SCSTR_WARN_ME_IN_FUTURE_CHECK));
 }
 
 sal_Int16 ScCbWarningBox::Execute()