ozone: Directly provide size of active mode from HardwareDisplayController

ui/ozone/platform/dri/gbm_surface.cc

Index: ui/ozone/platform/dri/gbm_surface.cc
diff --git a/ui/ozone/platform/dri/gbm_surface.cc b/ui/ozone/platform/dri/gbm_surface.cc
index 4bd41599ff96e6abed494c326da0aa61793e71b3..53cd08f0150bd40bf67184b3b1f44d84c54af3f7 100644
--- a/ui/ozone/platform/dri/gbm_surface.cc
+++ b/ui/ozone/platform/dri/gbm_surface.cc
@@ -100,8 +100,7 @@ bool GbmSurface::Initialize() {
   // creation doesn't fail.
   gfx::Size size(1, 1);
   if (window_delegate_->GetController()) {
-    const drmModeModeInfo& mode = window_delegate_->GetController()->get_mode();
-    size.SetSize(mode.hdisplay, mode.vdisplay);
+    size = window_delegate_->GetController()->GetModeSize();
   }
   // TODO(dnicoara) Check underlying system support for pixel format.
   native_surface_ =