cros: Use runtime stylus detection for ash palette.

ash/common/test/test_palette_delegate.cc

Index: ash/common/test/test_palette_delegate.cc
diff --git a/ash/common/test/test_palette_delegate.cc b/ash/common/test/test_palette_delegate.cc
index d05ec4aba4b815264c8a7d266c6ae3a96625ec21..ab5692fb7d220b38478473c32519f2bbdeb7c858 100644
--- a/ash/common/test/test_palette_delegate.cc
+++ b/ash/common/test/test_palette_delegate.cc
@@ -25,10 +25,6 @@ bool TestPaletteDelegate::HasNoteApp() {
   return has_note_app_;
 }
 
-void TestPaletteDelegate::SetStylusStateChangedCallback(
-    const PaletteDelegate::OnStylusStateChangedCallback&
-        on_stylus_state_changed) {}
-
 bool TestPaletteDelegate::ShouldAutoOpenPalette() {
   return should_auto_open_palette_;
 }