Revert "Generate some of the C++ bindings for mojom tagged unions."

mojo/public/tools/bindings/generators/mojom_cpp_generator.py

Index: mojo/public/tools/bindings/generators/mojom_cpp_generator.py
diff --git a/mojo/public/tools/bindings/generators/mojom_cpp_generator.py b/mojo/public/tools/bindings/generators/mojom_cpp_generator.py
index 03c9b6c97ba807c2c8dab357295ec8e477ebc51d..34bba30e69be34948f5bd666dc76fbfc94388e61 100644
--- a/mojo/public/tools/bindings/generators/mojom_cpp_generator.py
+++ b/mojo/public/tools/bindings/generators/mojom_cpp_generator.py
@@ -283,9 +283,6 @@ def ShouldInlineStruct(struct):
       return False
   return True
 
-def ShouldInlineUnion(union):
-  return not all(not mojom.IsMoveOnlyKind(field.kind) for field in union.fields)
-
 def GetArrayValidateParams(kind):
   if (not mojom.IsArrayKind(kind) and not mojom.IsMapKind(kind) and
       not mojom.IsStringKind(kind)):
@@ -337,7 +334,6 @@ class Generator(generator.Generator):
     "get_pad": pack.GetPad,
     "has_callbacks": mojom.HasCallbacks,
     "should_inline": ShouldInlineStruct,
-    "should_inline_union": ShouldInlineUnion,
     "is_array_kind": mojom.IsArrayKind,
     "is_cloneable_kind": mojom.IsCloneableKind,
     "is_enum_kind": mojom.IsEnumKind,
@@ -351,13 +347,11 @@ class Generator(generator.Generator):
     "is_string_kind": mojom.IsStringKind,
     "is_struct_kind": mojom.IsStructKind,
     "is_struct_with_handles": IsStructWithHandles,
-    "is_union_kind": mojom.IsUnionKind,
     "struct_size": lambda ps: ps.GetTotalSize() + _HEADER_SIZE,
     "struct_from_method": generator.GetStructFromMethod,
     "response_struct_from_method": generator.GetResponseStructFromMethod,
     "stylize_method": generator.StudlyCapsToCamel,
     "to_all_caps": generator.CamelCaseToAllCaps,
-    "under_to_camel": generator.UnderToCamel,
   }
 
   def GetJinjaExports(self):
@@ -369,7 +363,6 @@ class Generator(generator.Generator):
       "kinds": self.module.kinds,
       "enums": self.module.enums,
       "structs": self.GetStructs(),
-      "unions": self.module.unions,
       "interfaces": self.module.interfaces,
     }