[mus]Add FrameGenerator::SetHighContrastMode(bool)

services/ui/ws/test_utils.cc

Index: services/ui/ws/test_utils.cc
diff --git a/services/ui/ws/test_utils.cc b/services/ui/ws/test_utils.cc
index 94e8dbcdf008a2b6bed62508a7663499a84088c7..4e0c1ae9220a0b68f6b492ead2d7d5fa2851f70b 100644
--- a/services/ui/ws/test_utils.cc
+++ b/services/ui/ws/test_utils.cc
@@ -159,16 +159,6 @@ TestPlatformDisplayFactory::CreatePlatformDisplay(
   return base::MakeUnique<TestPlatformDisplay>(metrics, cursor_storage_);
 }
 
-// TestFrameGeneratorDelegate -------------------------------------------------
-
-TestFrameGeneratorDelegate::TestFrameGeneratorDelegate() {}
-
-TestFrameGeneratorDelegate::~TestFrameGeneratorDelegate() {}
-
-bool TestFrameGeneratorDelegate::IsInHighContrastMode() {
-  return false;
-}
-
 // WindowTreeTestApi  ---------------------------------------------------------
 
 WindowTreeTestApi::WindowTreeTestApi(WindowTree* tree) : tree_(tree) {}