Remove a lame assertion from one_copy_tile_task_worker_pool.cc.

cc/raster/one_copy_tile_task_worker_pool.cc

Index: cc/raster/one_copy_tile_task_worker_pool.cc
diff --git a/cc/raster/one_copy_tile_task_worker_pool.cc b/cc/raster/one_copy_tile_task_worker_pool.cc
index 9aa97502d7efdc88fb116685bb0d41e2a5ccc61d..f0062854220eb86d3e2339e7baf84a132e87d88a 100644
--- a/cc/raster/one_copy_tile_task_worker_pool.cc
+++ b/cc/raster/one_copy_tile_task_worker_pool.cc
@@ -341,9 +341,6 @@ void OneCopyTileTaskWorkerPool::PlaybackAndCopyOnWorkerThread(
                   use_partial_raster_
                       ? gfx::BufferUsage::GPU_READ_CPU_READ_WRITE_PERSISTENT
                       : gfx::BufferUsage::GPU_READ_CPU_READ_WRITE);
-      DCHECK_EQ(gfx::NumberOfPlanesForBufferFormat(
-                    staging_buffer->gpu_memory_buffer->GetFormat()),
-                1u);
     }
 
     gfx::Rect playback_rect = raster_full_rect;