Revert "helper/schema: TypeMap computed should mark diff as cmputed"

This reverts commit b73078c670.

helper/schema/schema.go

@@ -584,13 +584,6 @@ func (m schemaMap) diffMap(
 
 	// If the new map is nil and we're computed, then ignore it.
 	if n == nil && schema.Computed {
-		// If we don't have an old value, this whole map is computed
-		if o == nil {
-			diff.Attributes[k] = &terraform.ResourceAttrDiff{
-				NewComputed: true,
-			}
-		}
-
 		return nil
 	}
 

helper/schema/schema_test.go

@@ -1292,29 +1292,6 @@ func TestSchemaMap_Diff(t *testing.T) {
 			Err: false,
 		},
 
-		{
-			Schema: map[string]*Schema{
-				"vars": &Schema{
-					Type:     TypeMap,
-					Computed: true,
-				},
-			},
-
-			State: nil,
-
-			Config: nil,
-
-			Diff: &terraform.InstanceDiff{
-				Attributes: map[string]*terraform.ResourceAttrDiff{
-					"vars": &terraform.ResourceAttrDiff{
-						NewComputed: true,
-					},
-				},
-			},
-
-			Err: false,
-		},
-
 		{
 			Schema: map[string]*Schema{
 				"config_vars": &Schema{