Revert "Update mojo sdk to rev 1dc8a9a5db73d3718d99917fadf31f5fb2ebad4f"

third_party/mojo/src/mojo/public/interfaces/bindings/tests/test_unions.mojom

Index: third_party/mojo/src/mojo/public/interfaces/bindings/tests/test_unions.mojom
diff --git a/third_party/mojo/src/mojo/public/interfaces/bindings/tests/test_unions.mojom b/third_party/mojo/src/mojo/public/interfaces/bindings/tests/test_unions.mojom
index 6c573bce1404ae75e8753272e22668fdedadaca7..4e7a540d02f6e3a09267ff946ab045eba10f4f10 100644
--- a/third_party/mojo/src/mojo/public/interfaces/bindings/tests/test_unions.mojom
+++ b/third_party/mojo/src/mojo/public/interfaces/bindings/tests/test_unions.mojom
@@ -40,11 +40,6 @@ union HandleUnion {
   handle<data_pipe_consumer> f_data_pipe_consumer;
   handle<data_pipe_producer> f_data_pipe_producer;
   handle<shared_buffer> f_shared_buffer;
-  SmallCache f_small_cache;
-};
-
-struct HandleStruct {
-  SmallCache f_small_cache;
 };
 
 struct DummyStruct {
@@ -55,10 +50,8 @@ struct SmallStruct {
   DummyStruct? dummy_struct;
   PodUnion? pod_union;
   array<PodUnion>? pod_union_array;
-  array<PodUnion?>? nullable_pod_union_array;
   array<DummyStruct>? s_array;
   map<string, PodUnion>? pod_union_map;
-  map<string, PodUnion?>? nullable_pod_union_map;
 };
 
 struct SmallStructNonNullableUnion {
@@ -68,12 +61,3 @@ struct SmallStructNonNullableUnion {
 struct SmallObjStruct {
   ObjectUnion obj_union;
 };
-
-interface SmallCache {
-  SetIntValue(int64 int_value);
-  GetIntValue() => (int64 int_value);
-};
-
-interface UnionInterface {
-  Echo(PodUnion in) => (PodUnion out);
-};