Revert "Re-land deferred compositing updates with fixed assumptions"

LayoutTests/TestExpectations

Index: LayoutTests/TestExpectations
diff --git a/LayoutTests/TestExpectations b/LayoutTests/TestExpectations
index 9ce1f3429bd5536c5b12ad67a3ad72081e37370d..e3c273318c3d0f6b99c1644b87b8b032d6886729 100644
--- a/LayoutTests/TestExpectations
+++ b/LayoutTests/TestExpectations
@@ -38,10 +38,6 @@ crbug.com/233124 http/tests/inspector/network/network-size.html [ Skip ]
 crbug.com/233124 http/tests/inspector/network/network-size-chunked.html [ Skip ]
 crbug.com/233124 http/tests/inspector/network/network-size-sync.html [ Skip ]
 
-# These tests are sensitive to the number of compositing updates between portions of the test.
-crbug.com/313922 [ Mac ] inspector/layer-tree-model.html [ Failure ]
-crbug.com/313922 [ Mac ] inspector-protocol/layers/get-layers.html [ Failure ]
-
 # -----------------------------------------------------------------
 # Plugin tests
 # -----------------------------------------------------------------