remove some stray using rtl::OUString

Change-Id: I47d84f1b0c758bd390d8a5c1895dbb3548999bb6

svx/source/gallery2/galbrws2.cxx

@@ -62,8 +62,6 @@
 #define TBX_ID_ICON 1
 #define TBX_ID_LIST 2
 
-using rtl::OUString;
-
 GalleryBrowserMode GalleryBrowser2::meInitMode = GALLERYBROWSERMODE_ICON;
 
 struct DispatchInfo

svx/source/sidebar/nbdtmg.cxx

@@ -57,7 +57,6 @@ using namespace com::sun::star::lang;
 using namespace com::sun::star::text;
 using namespace com::sun::star::container;
 using namespace com::sun::star::style;
-using rtl::OUString;
 
 namespace svx { namespace sidebar {
 #define MAX_VALUESET_GRAPHIC    30

svx/source/sidebar/tools/ValueSetWithTextControl.cxx

@@ -46,7 +46,6 @@ using namespace com::sun::star::i18n;
 using namespace com::sun::star::text;
 using namespace com::sun::star::container;
 using namespace com::sun::star::style;
-using rtl::OUString;
 
 namespace svx { namespace sidebar {
 

toolkit/source/awt/vclxmenu.cxx

@@ -38,9 +38,6 @@
 
 #include <com/sun/star/awt/KeyModifier.hpp>
 
-using rtl::OUString;
-using rtl::OUStringBuffer;
-
 DBG_NAME(VCLXMenu)
 
 VCLXMenu::VCLXMenu()