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

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

Index: ui/ozone/platform/drm/test/mock_drm_device.h
diff --git a/ui/ozone/platform/drm/test/mock_drm_device.h b/ui/ozone/platform/drm/test/mock_drm_device.h
index cd9a2f225cf621a85f980b94a5866ff0872779c9..5632b6e2043febaa94c3334316c08cb85664ffc6 100644
--- a/ui/ozone/platform/drm/test/mock_drm_device.h
+++ b/ui/ozone/platform/drm/test/mock_drm_device.h
@@ -16,7 +16,6 @@
 namespace ui {
 
 class CrtcController;
-struct GammaRampRGBEntry;
 
 // The real DrmDevice makes actual DRM calls which we can't use in unit tests.
 class MockDrmDevice : public ui::DrmDevice {
@@ -109,8 +108,6 @@
   bool CommitProperties(drmModePropertySet* properties,
                         uint32_t flags,
                         const PageFlipCallback& callback) override;
-  bool SetGammaRamp(uint32_t crtc_id,
-                    const std::vector<GammaRampRGBEntry>& lut) override;
 
  private:
   ~MockDrmDevice() override;