Revert of Load and apply a vcgt table from an ICC file to the internal display

ui/ozone/platform/drm/test/mock_drm_device.cc

Index: ui/ozone/platform/drm/test/mock_drm_device.cc
diff --git a/ui/ozone/platform/drm/test/mock_drm_device.cc b/ui/ozone/platform/drm/test/mock_drm_device.cc
index 0b1e3485e0c5553bbe25167f46edbd1782780724..3a822dcd4a29cd03b5e3219c9ddb695d2f1e4e2f 100644
--- a/ui/ozone/platform/drm/test/mock_drm_device.cc
+++ b/ui/ozone/platform/drm/test/mock_drm_device.cc
@@ -240,11 +240,6 @@
   return false;
 }
 
-bool MockDrmDevice::SetGammaRamp(uint32_t crtc_id,
-                                 const std::vector<GammaRampRGBEntry>& lut) {
-  return true;
-}
-
 void MockDrmDevice::RunCallbacks() {
   while (!callbacks_.empty()) {
     PageFlipCallback callback = callbacks_.front();