Bug 1451099. Avoid expensive debugging matrix transform.

gfx/layers/wr/WebRenderCommandBuilder.cpp

@@ -356,15 +356,10 @@ struct DIGroup
       aData->mGeometry = Move(geometry);
       nsRect bounds = combined.GetBounds();
 
-      auto transBounds = nsLayoutUtils::MatrixTransformRect(bounds,
-                                                            Matrix4x4::From2D(aMatrix),
-                                                            float(appUnitsPerDevPixel));
-
       IntRect transformedRect = ToDeviceSpace(combined.GetBounds(), aMatrix, appUnitsPerDevPixel, mGroupOffset);
       ToDeviceSpace(combined.GetBounds(), aMatrix, appUnitsPerDevPixel, mGroupOffset);
       aData->mRect = transformedRect.Intersect(imageRect);
       GP("CGC %s %d %d %d %d\n", aItem->Name(), bounds.x, bounds.y, bounds.width, bounds.height);
-      GP("transBounds %d %d %d %d\n", transBounds.x, transBounds.y, transBounds.width, transBounds.height);
       GP("%d %d,  %f %f\n", mGroupOffset.x, mGroupOffset.y, aMatrix._11, aMatrix._22);
       GP("mRect %d %d %d %d\n", aData->mRect.x, aData->mRect.y, aData->mRect.width, aData->mRect.height);
       InvalidateRect(aData->mRect);