a11y: Don't claim implementing "com.sun.star.awt.AccessibleHeaderBar"

There is no "com.sun.star.awt.AccessibleHeaderBar" service,
so don't claim implementing it in VCLXAccessibleHeaderBar.

Also drop VCLXAccessibleHeaderBar::getImplementationName because
there is no need to use a different implementation name than the
base class.

Change-Id: I3fde8be90d503435a27dd5581986a5fa256d43f5
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/210356
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

vcl/inc/accessibility/vclxaccessibleheaderbar.hxx

@@ -41,10 +41,6 @@ public:
         SAL_CALL getAccessibleChild(sal_Int64 i) override;
     virtual sal_Int16 SAL_CALL getAccessibleRole() override;
 
-    // XServiceInfo
-    virtual OUString SAL_CALL getImplementationName() override;
-    virtual css::uno::Sequence<OUString> SAL_CALL getSupportedServiceNames() override;
-
 public:
     virtual void SAL_CALL disposing() override;
     rtl::Reference<VCLXAccessibleHeaderBarItem> CreateChild(sal_Int32 i);

vcl/source/accessibility/vclxaccessibleheaderbar.cxx

@@ -40,18 +40,6 @@ VCLXAccessibleHeaderBar::VCLXAccessibleHeaderBar(HeaderBar* pHeaderBar)
 
 VCLXAccessibleHeaderBar::~VCLXAccessibleHeaderBar() {}
 
-// XServiceInfo
-
-OUString VCLXAccessibleHeaderBar::getImplementationName()
-{
-    return u"com.sun.star.comp.toolkit.AccessibleHeaderBar"_ustr;
-}
-
-Sequence<OUString> VCLXAccessibleHeaderBar::getSupportedServiceNames()
-{
-    return { u"com.sun.star.awt.AccessibleHeaderBar"_ustr };
-}
-
 // =======XAccessibleContext=======
 
 sal_Int64 SAL_CALL VCLXAccessibleHeaderBar::getAccessibleChildCount()